Prep the chicken: Pat the chicken breasts dry. If thick, slice horizontally to create cutlets about 3/4-inch thick, or pound lightly to even thickness.
This helps the chicken cook evenly.
Season: Rub chicken with 1 tablespoon olive oil. Sprinkle both sides with salt, pepper, Italian seasoning, and garlic powder. Let it sit while you prep the topping.
Make the bruschetta: In a bowl, combine diced tomatoes, minced garlic, basil, red onion (if using), 1 tablespoon extra-virgin olive oil, balsamic vinegar, a pinch of salt, and pepper.
Stir gently. Taste and adjust seasoning. Set aside to marinate.
Preheat the air fryer: Preheat to 375°F (190°C) for 3–5 minutes.
Lightly spray the basket to prevent sticking.
Cook the chicken: Add chicken to the basket in a single layer. Air fry for 8–10 minutes, flipping halfway, until the internal temperature reaches 160°F (71°C). Time can vary by thickness and air fryer model.
Add cheese: Top each piece with mozzarella.
Air fry 1–2 more minutes, until cheese is melted and the chicken hits 165°F (74°C).
Finish and serve: Let chicken rest for 2–3 minutes. Spoon generous amounts of bruschetta over the top. Add a squeeze of lemon or a light balsamic drizzle if you like.
Serve immediately.