Slice the eggplant into 1/2-inch rounds and pat dry with a paper towel.
Set up a breading station with three shallow bowls: flour in the first, beaten eggs in the second, and a mixture of breadcrumbs, Parmesan cheese, and Italian seasoning in the third.
Dredge each eggplant slice in flour, dip in egg, and coat with the breadcrumb mixture.
Preheat air fryer to 375°F. Spray the air fryer basket and both sides of breaded eggplant slices with olive oil.
Place eggplant slices in the air fryer basket in a single layer and cook for 10 minutes, flipping halfway through.
Top each slice with marinara sauce and mozzarella cheese, then return to the air fryer for an additional 3-5 minutes or until cheese is bubbly.