You may not have thought to make a frittata in your air fryer, but you can! You'll get a gorgeous brown crust with a creamy interior—and clever use of a cake pan makes it a cinch to unmold. We used Havarti for its mild flavor and superior melting qualities, but substitute another good melting cheese such as Cheddar, jack or fontina if you like. Serve the frittata warm or at room temperature.