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Caramelized Onion Mushroom Swiss Turkey Burger

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These delicious Caramelized Onion Mushroom Swiss Burgers are loaded with sweet caramelized onions and sautéed mushrooms and are the perfect burger for any BBQ or gathering. Bonus: all the ingredients can be prepped ahead of time.
Servings: 4 people
Total Time: 50 minutes
burger on plate topped with caramelized onions, mushrooms, and swiss cheese

It almost never fails, when we are traveling and stop at a local microbrewery or other casual eateries, Melissa is going to order a burger and fries. We’ve tried all varieties of burgers that include a variety of ground meats, but as we get older we keep looking for healthier alternatives. One of the most delicious and satisfying is the old standby: the turkey burger. It’s nice to add some other elements to bump up the umami on what can be a rather bland turkey burger, so this caramelized onion mushroom Swiss turkey burger is one of our tried and true favorites.

burger on plate topped with caramelized onions, mushrooms, and swiss cheese

Everything can be made ahead, from the caramelized onions to the turkey patties themselves. This will definitely speed up the preparation time, especially the onions as true caramelized onions take some time to make properly.

Key Ingredients and Substitutions


Burgers are no longer just fast food, and the investment you make in preparation time and ingredients will determine how memorable your creations are. None of the ingredients are especially expensive, so you might as well buy the best you can find. Turkey by itself can be somewhat bland and dry, so skipping the herbs and spices is not recommended. Feel free to experiment with some of your own favorite sauces and spices to tailor the flavor to your own personal tastes.

The full ingredient list and measurements are listed in the printable recipe below.

ingredients for turkey burger
  • Turkey. There is some variation in the quality and price of ground turkey, but even the best isn’t all that expensive. Deciding the best lean-to-fat ratio may be your biggest conundrum, especially if you are health-focused. While you can purchase 99% lean ground turkey, we really recommend something in the 80-85% range so your burgers don’t come out too dry and flavorless.
  • Caramelized Onions. This is a simple caramelized onion recipe that requires an investment in patience to yield the best results. It doesn’t take much longer to make a double or triple batch, and they freeze and reheat very well. Starting from scratch will more than double the preparation time, so do your future self a favor and make some extra if this is your first time.
  • Mushroom. We used Cremini (or Baby Bellas) for this recipe, but any mushroom would work including the white buttons found at any supermarket. If you really want to raise the bar for this burger, try some Shiitake, Oyster, or Chanterelles – all of them are umami bombs that elevate this burger to the next level.
  • Swiss Cheese. We just used pre-sliced deli swiss cheese which made preparation easy. If you really love this ingredient though, buying some Emmenthaler or Gruyère can only enhance the flavors of the onions and mushrooms.

How to Make Caramelized Onion Mushroom Swiss Turkey Burger


Here are the quick step-by-step instructions with visuals; you can find the full instructions with the exact ingredients in the recipe card below.
This post may contain paid affiliate sales links. As an Amazon Associate, I earn from qualifying purchases. Please see my full disclaimer policy for details.

Pro-tip: Caramelized onions can be made in advance and frozen for future use so make a big batch and then freeze it in a freezer-safe container.

1. Caramelize the Onions: Roughly chop the onions so that slices are between ⅛ and ¼ inches thick. Heat the butter and olive oil in a saucepan on medium heat. Once the butter has melted, add onions and sweat them until they become translucent. Reduce heat to low and continue to cook onions, stirring every 5-10 minutes to prevent them from sticking. Deglaze the pan with a tablespoon or two of water or chicken stock when fond starts to form on the pan. As onions continue to caramelize, continue stirring every 5-10 minutes and deglazing the saucepan as fond forms and the onions are no longer loose in the pan. When the onions achieve a deep golden brown (or dark brown) remove them from heat and set aside.

step 1 caramelizing the onions

2. Sauté the Mushrooms: In a cast-iron skillet over medium heat, heat the olive oil and butter. Add mushrooms and sauté until they have released their water,  approximately 2-3 minutes. Remove mushrooms from skillet and set aside.

step 2 sautéing mushrooms in a cast iron pan

3. Prepare the Burger Patties: In a large bowl mix together ground turkey with Worcestershire sauce, kosher salt, black pepper, panko breadcrumbs, garlic salt, onion powder, and chopped fresh parsley. Divide the turkey mixture into three equal portions and form them into patties. Place patties on a small baking sheet and refrigerate for 10-15 minutes. Note: This step can be done in advance just keep the burger patties refrigerated until ready to cook.

step 3 preparing the turkey burger patties

4. Cook the burger: In the same cast-iron skillet used to sautéed the mushrooms, cook turkey patties for approximately 3-5 minutes per side then cover with a lid to help cook the center all the way through. When burgers have reached an internal temperature of 165 degrees top with cheese and cover until cheese has melted.

step 4 cooking the turkey burger patties in a cast iron pan

5. Plate: Serve burgers on a toasted bun and top with sautéed mushrooms and caramelized onions.  Add additional toppings if desired.

turkey burger topped with caramelized onions, mushrooms, and swiss cheese on a plate with a side of veggie fries

Recipe Pro-Tips and Notes


  • Use a preheated cast-iron or nonstick skillet to get a browned seared exterior.
  • Turkey burgers can also be grilled on an outside gas or charcoal grill for added flavor.
  • Turkey burgers need to be cooked to an internal temperature of 165 degrees. Above 165 degrees and burgers will begin to dry out.
  • To bind the patties together use breadcrumbs. It will also help the patties keep their shape.
  • Turkey burgers are best served immediately when they are still juicy.

Make-Ahead and Storage


Make-Ahead: Make the turkey burgers through step 2 of the recipe (prior to cooking). Place them on a baking sheet and cover them with plastic wrap. Refrigerate up to one day prior to cooking. The onions and mushrooms can also be cooked in advance and then refrigerated in an air-tight container.

How to Store: For cooked burgers, allow them to cool completely then tightly wrap individual burgers with plastic wrap, aluminum foil, or food-safe storage containers to prevent drying and airflow. Cooked turkey burgers can be stored safely in the refrigerator for up to 3-4 days or frozen for up to 3 months. For uncooked burgers, make the turkey burgers through step 2 of the recipe then place burgers on a parchment-lined baking sheet and put them in the freezer for one hour. Once the patties have partially frozen, layer them between parchment paper in a freezer bag or freezer-safe container. Freeze burgers for up to 3 months. To cook, thaw burgers overnight in the refrigerator and then cook as recommended in step 3 of the recipe.

How to Reheat: Leftover burgers that have been cooked can be reheated in the oven, stovetop, or microwave. Avoid partial reheating, which can create a breeding ground for bacteria.

  • Oven Reheating: Preheat the oven to 350°F. Place burgers on a baking sheet and reheat for 7-10 minutes, flipping halfway through. Check internal temperature with a food thermometer; it should reach 165°F. Add the Swiss cheese, do so in the last 1-2 minutes.
  • Stovetop: Heat a skillet over medium heat. Add a little oil or butter if needed and place burgers in the pan then cook for 3-5 minutes per side, until heated through and browned. Check internal temperature with a food thermometer; it should reach 165°F.
  • Microwave: Place burgers on a microwave-safe plate with a splash of water or broth to add moisture. Cover loosely with a microwave-safe lid or plastic wrap and heat on medium power for 1-2 minutes per patty, flipping halfway through. Check internal temperature with a food thermometer; it should reach 165°F.

The sautéed mushrooms can be reheated on the stovetop or in the microwave. For stovetop reheating, place a skillet over medium-heat with butter or oil and add the mushrooms and cook for 2-3 minutes, stirring occasionally, until warmed through. You can add a splash of water, broth, or even some red wine to deglaze the pan and add flavor. To reheat in the microwave, place the mushrooms in a microwave-safe bowl with a splash of water or broth. Cover loosely with a microwave-safe lid or plastic wrap and heat on medium power for 1-2 minutes, stirring halfway through.

The best way to reheat caramelized onions is on the stovetop. Add a spoonful of oil or butter to a skillet over low heat. Gently stir in the caramelized onions and scrape up any browned bits from the bottom for extra flavor. Heat through for 5-7 minutes, until warmed and fragrant. To reheat in the microwave, place the caramelized onions in a microwave-safe bowl with a splash of water or broth. Cover loosely with a lid or plastic wrap and microwave on medium power for 1-2 minutes, stirring halfway through. Be careful not to overcook as it can become rubbery.

Frequently Asked Questions


How long should turkey burgers cook?

Turkey burgers need to be cooked to an internal temperature of 165 degrees. To get the juiciest burger avoid cooking them past 165 degrees.

Do turkey burgers fall apart?

You can prevent them from falling apart by adding a filler such as breadcrumbs. We like using panko for our burgers but you can also use crushed crackers or an egg. Turkey patties should also be made thicker than your traditional beef patty so opt for a patty that is 3/4 – 1 inch thick. This will help them from falling apart as you flip them.

burger on plate topped with caramelized onions, mushrooms, and swiss cheese

More Burgers to Try


Looking for more delicious burger recipes? Try these other favorites:

  • Bacon Blue Cheese Burger – Crafted from premium ground beef, these gourmet patties are grilled and topped with crispy bacon and melty blue cheese.
  • Philly Cheesesteak Sliders – These sliders pack all the flavor of the classic Philly cheesesteak into soft, buttery rolls. Thinly sliced steak sizzles with sautéed onions, then gets smothered in melty Provolone cheese.
  • Nashville Hot Honey Chicken Slider Sandwiches – Crisp and spicy with tender chicken coated with a hot honey sauce and topped with coleslaw and pickle slices on slider rolls.

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burger on plate topped with caramelized onions, mushrooms, and swiss cheese

Caramelized Onion Mushroom Swiss Turkey Burger

Posted by Jim
These delicious Caramelized Onion Mushroom Swiss Burgers are loaded with sweet caramelized onions and sautéed mushrooms and are the perfect burger for any BBQ or gathering. Bonus: all the ingredients can be prepped ahead of time.
5 from 2 votes

This recipe may contain paid affiliate sales links. As an Amazon Associate, I earn from qualifying purchases. Please see my full disclaimer policy for details.

Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Course Main Course
Cuisine American
Servings 4 people
Calories 467 kcal

Equipment

Ingredients  

Caramelized Onions

  • 1 large sweet or yellow onion, peeled
  • ¾ tablespoon olive oil
  • ¾ tablespoon unsalted butter
  • ½ cup water or chicken stock

Sauteed Mushrooms

  • 2 tablespoons olive oil
  • 6 ounces mushrooms, stemmed and sliced
  • ½ teaspoon unsalted butter

Burger

  • 16 ounces ground turkey, 85% lean
  • 1 tablespoon Worcestershire sauce
  • ½ teaspoon kosher salt
  • ½ teaspoon black pepper
  • ¼ cup panko breadcrumbs
  • ½ teaspoon garlic salt
  • 1 teaspoon onion powder
  • 3 tablespoons chopped parsley
  • 4 slices Swiss cheese
  • 4 hamburger buns

Instructions 

Caramelized Onions

  • Rough chop onions so that slices are between ⅛ and ¼ inches thick.
  • Heat the butter and olive oil in a large saucepan on medium heat. Once the butter has melted, add onions and sweat them until they become translucent.
  • Reduce heat to low and continue to cook onions, stirring every 5-10 minutes to prevent them from sticking. Deglaze saucepan with a tablespoon or two of water or chicken stock when fond starts to form on the pan.
  • As onions continue to caramelize, continue stirring every 5-10 minutes and deglazing the saucepan as fond forms and the onions are no longer loose in the pan.
  • When the onions achieve a deep golden-brown (or dark brown) remove from heat and set aside.

Sauteed Mushrooms

  • In a cast-iron skillet, heat olive oil and butter over medium heat. 
  • Add mushrooms and saute until they have released their water,  approximately 2-3 minutes. Remove mushrooms from skillet and set aside.

Burger

  • Combine ground turkey with Worcestershire sauce, kosher salt, black pepper, breadcrumbs, garlic salt, onion powder, and chopped parsley.
  • Divide the turkey mixture into three equal portions and form them into patties. Place patties on a small baking sheet and refrigerate for 10-15 minutes.
  • In the same cast-iron skillet used to sautee the mushrooms, cook turkey patties for approximately 3-5 minutes on each side.  When burgers have reached an internal temperature of 165 degrees top with cheese and cover until cheese has melted.
  • Serve burgers on a toasted bun and top with sauteed mushrooms and caramelized onions.  Add additional toppings if desired.

Notes

1. Use a preheated cast-iron or nonstick skillet to get a browned seared exterior.
2. Turkey burgers need to be cooked to an internal temperature of 165 degrees. Above 165 degrees and burgers will begin to dry out.
3. To bind the patties together use breadcrumbs. It will also help the patties keep their shape.
4. Turkey burgers are best served immediately when they are still juicy.
5. Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed. The nutritional value is only for the turkey burger patty, mushrooms, and caramelized onions.  It does not include the nutritional values of the cheese and hamburger buns which will vary by brand and type. It does not include the nutrition for any substitutions. 
Serving: 1burger | Calories: 467kcal | Carbohydrates: 21g | Protein: 36g | Fat: 27g | Saturated Fat: 6g | Polyunsaturated Fat: 5g | Monounsaturated Fat: 13g | Cholesterol: 109mg | Sodium: 914mg | Potassium: 621mg | Fiber: 2g | Sugar: 4g | Vitamin A: 50IU | Vitamin C: 14mg | Calcium: 45mg | Iron: 4mg
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