Whisk together the egg whites, eggs, milk, shredded mozzarella cheese, basil, garlic salt, and pepper together in a medium bowl.
Pour about 1/2 cup of egg mixture into ramekins. Makes enough for 8 ramekins. Or, pour into a cake dish, pizza pan, or other air fryer safe dish. The size of your air fryer and size of your dish will affect how much of the egg mixture you can cook at once. Don’t fill the dish more than halfway full.
Place a sliced tomato on top of the egg mixture.
Place in air fryer basket and cook for 15 minutes at 330 °F. (If you are cooking in an air fryer dish, cook for 20 minutes, add mozzarella cheese slices then cook for an additional 10-13 minutes)
Place a slice of fresh mozzarella on top of each ramekin. Cook for an additional 5-8 minutes, or until done at 330 °F. (May need to cut into 1 ramekin to see interior of eggs). (If you are cooking in an air fryer dish, add mozzarella cheese slices then cook for an additional 10-13 minutes)
Let the ramekins sit in the warm air fryer for an additional 3 or so minutes.
Let the ramekins sit at room temperature for several minutes before enjoying.