Prep the Fries. Start by preheating your air fryer to 400°F. Spread the frozen French fries in a single layer in the air fryer basket. Lightly spray with olive oil.
Air Fry the Fries. Cook the fries in the air fryer for 15-20 minutes, shaking the basket halfway through to ensure even cooking. The fries should be golden brown and crispy.
Add the Toppings. Once the fries are done, remove the basket from the air fryer. Sprinkle mozzarella cheese evenly over the fries. Add pepperoni slices on top. Sprinkle Italian seasoning over everything.
Melt the Cheese. Return the basket to the air fryer and cook for an additional 2-3 minutes, or until the cheese is melted and bubbly.
Garnish and Serve. Transfer the fries to a serving plate. Sprinkle with grated Parmesan cheese and garnish with fresh basil. Serve with marinara sauce on the side for dipping.