01 - Whisk together eggs, milk, salt, pepper, and Italian herbs in a medium bowl until completely smooth and well combined.
02 - Fold cherry tomatoes, spinach, bell pepper, onion, zucchini, and cheese into the egg mixture until evenly distributed.
03 - Preheat air fryer to 350°F for 3 minutes before cooking.
04 - Brush a 7-inch round oven-safe pan or cake tin thoroughly with olive oil to prevent sticking.
05 - Pour the vegetable and egg mixture into the prepared pan, spreading evenly.
06 - Place pan in air fryer basket and cook at 350°F for 12-15 minutes until set in center and golden brown on top.
07 - Let frittata cool for 2 minutes before slicing into wedges and serving warm.