Place zucchini slices in a single layer in the air fryer (you will need to work in batches) and lightly spray them with cooking spray. Cook for 5 minutes at 400 F.
Sprinkle the slices with salt and pepper to taste, then spoon about 1 tsp marinara sauce onto each slice.
Sprinkle Italian seasoning onto the slices to taste, then generously sprinkle with shredded mozzarella cheese. Optionally add mini pepperoni slices.
Cook for 5-6 minutes until cheese has melted. Remove, place the pizza bites on a plate, and repeat the process until you’ve made all of the zucchini.
Notes
A 6” medium zucchini yields approximately 24 slices