Prepare the Beef Patties:

• Divide the ground beef into 4 even balls (about 6 ounces each).
• Season with salt, black pepper, garlic powder, and onion powder.

Sear & Smash the Patties:

• Heat olive oil in a large skillet over medium-high heat.
• Place the beef balls in the skillet and sear for 2 minutes.
• Use a spatula to smash them into thin patties.
• Cook for 2 more minutes until a deep sear forms.
• Flip and cook until the other side is seared and fully cooked.
• Transfer patties to a clean plate and keep the drippings in the pan.

Caramelize the Onions:

• Add the sliced onions to the same pan and sauté for 10 minutes, stirring occasionally, until soft and golden brown.
• Transfer onions to the plate with the burgers.

Toast the Buns:

• Spread softened butter over the split sides of the buns.
• Wipe the skillet clean and reduce heat to medium-low.
• Place two bun halves (preferably the tops) buttered side down in the pan.

Assemble the Patty Melt:

• Add 1 slice of American cheese on each toasted bun.
• Place 1 cooked burger patty on top.
• Add sautéed onions, then another cheese slice.
• Top with a second burger patty and a final cheese slice.
• Place the remaining buns on top, buttered side up.

Grill the Patty Melt:

• Toast for 2 to 4 minutes per side, occasionally pressing with a spatula to compact the sandwich.
• Cook until crispy, golden, and melted inside.

Serve & Enjoy:

• Serve with ketchup, mustard, and mayo on the side for customization.
• Add lettuce and tomato if desired.