For an extra layer of flavor, consider adding a pinch of smoked paprika or a dash of hot sauce to the egg mixture. Feel free to customize the cheese and vegetable selection to your liking. Cheddar cheese, bell peppers, or mushrooms would all be delicious additions. If you don't have an air fryer, you can bake the frittata in a conventional oven preheated to 350°F (175°C) for approximately 20-25 minutes, or until a toothpick inserted into the center comes out clean.