Prepare the Patties: Divide the ground beef into 4 equal portions and shape each portion into a patty about ¾-inch thick. Season both sides of each patty with salt and pepper.

Heat the Pan: Heat the avocado oil (or your choice of oil) in a large skillet over medium-high heat. Once the oil is hot and shimmering, place the patties in the pan.

Cook the Patties: Cook the patties for about 4-5 minutes per side for medium doneness. Adjust the time depending on how well-done you like your burgers. For well-done burgers, cook an additional minute per side.

Add the Cheese: In the final minute of cooking, place a slice of cheese on each patty. Cover the skillet with a lid to help the cheese melt quickly.

Toast the Buns: While the burgers are cooking, spread butter on the cut sides of the buns. Toast them in a separate skillet over medium heat for 1-2 minutes, or until golden brown.

Assemble the Burgers: Place each cooked burger patty onto the bottom half of the toasted buns. Add your favorite toppings, such as onion, tomato, lettuce, pickles, ketchup, mustard, or anything else you love.

Serve: Top with the other half of the bun, and serve immediately with fries, chips, or your favorite side dish!