Divide ground beef into two portions and press into patties; season with salt and pepper.
Melt butter on a skillet and toast burger buns until golden.
Cook beef patties on high heat for 3-4 minutes per side.
Place cheddar cheese slice on top of patties during final minute of cooking to melt.
Assemble burgers with lettuce, sliced tomato, pickles, and cooked cheese patties.