In a medium bowl, combine ground beef, salt, and pepper with your hands. Be careful not to over-mix.
Take about 2-2 ½ ounces or 2 tablespoons worth of ground beef and roll it in the palm of your hand like you are making meatballs. Flatten the top slightly and set aside on a baking sheet.
Grill the burger patties to your desired level of doneness, usually about 2-3 minutes per side for medium-rare. Do not mash the burgers with the spatula, as this will release all the juices and make them dry.
Add a small slice of cheese to each patty during the last minute of grilling. You can cover with a lid or a melting dome to help melt the cheese.
Remove the patties from the heat and let them rest.
Slider Buns
Lightly spread a layer of butter on each cut side of the burger bun. Make sure to spread it all the way to the edges.
On a griddle over medium-high heat, put the buttered side of the buns down and allow them to cook for about 1-2 minutes or until they are golden brown.
Mini Burger Assembly
Spread mayonnaise on the bottom half of each slider bun.
If desired, place a lettuce leaf and a slice of tomato on top of the mayo then top it with a burger patty. Spoon a generous amount of caramelized onions over the patty.
Cover each burger with the top half of the slider bun. Enjoy with your favorite side dishes or a salad.
Notes
1. 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 just for the mini burger patty with cheese and the bun and does not include any additional toppings. The nutritional value will vary based on the ingredients used (example: burger buns, ground beef, cheese, and toppings). It does not include the nutrition for any substitutions or additions.2. Be sure to check out the Key Ingredients along with the Recipe Tips and Notes sections found in the post, for more tips, options, substitutions, and variations for this recipe! You will also find step-by-step photos.