Preheat the air fryer to 370F, Air Fryer Setting.
In a large bowl, combine beef, grated butter, Worcestershire sauce, garlic, and onion powder.
Divide the mixture into 4 equal parts, then form patties. Press a thumb into the center of each patty to create an indentation so that the patty holds its shape as it cooks.
Salt and pepper both sides of the patties
Place patties in a single layer in the preheated basket.
Cook for 5 minutes, then flip.
Cook for an additional 5 minutes
Optional: Turn off the air fryer, open the basket, and place a slice of cheese on each patty. Close the basket for about a minute to melt the cheese.
Add your favorite toppings.