In a bowl, mix ground beef, salt, and black pepper until just combined. Do not overmix.
Form the mixture into 4 equal patties, making a small indentation in the center of each patty.
Place the patties in the air fryer basket in a single layer. Cook for 10-12 minutes, flipping halfway through, until the internal temperature reaches 160°F (71°C).
Toast the burger buns in the air fryer for 1-2 minutes if desired.
Assemble the burgers with your favorite toppings and serve immediately.