Slice the onion and tomato. Wash the lettuce leaves. Measure the seasonings and prepare all toppings before cooking. Smash burgers cook very quickly, so everything should be ready first.

Divide the ground beef into eight equal portions. Roll each portion into a loose ball. Do not press the meat tightly because loose beef creates better crispy edges.

Place a cast iron skillet over high heat. Add vegetable oil and let the skillet become very hot. A hot cooking surface creates the famous golden crust.

Place two beef balls onto the skillet. Immediately press each one flat using a metal spatula or burger press. Press firmly for about ten seconds to create thin patties.

Sprinkle salt and black pepper evenly over each patty. Let them cook without moving for about two minutes until deep brown crispy edges develop naturally.

Flip the patties carefully using a sturdy spatula. Immediately place American cheese on top. Cook for another one minute until the cheese melts completely and the burger finishes cooking.

Spread butter lightly on the inside of each bun. Toast them in the skillet for one to two minutes until golden and slightly crispy.

Spread smash burger sauce on the toasted buns. Add lettuce, tomato, onions, pickles, two cheesy patties, and the top bun. Serve immediately while hot and juicy.