Step 1

Place a nonstick 6-inch round cake pan in an air fryer and preheat to 350 degrees F (175 degrees C).

Step 2

Remove the cake pan with an oven mitt when air fryer reaches temperature. Add oil to the pan, and then add onion, carrot, celery and parsley; mix to combine.

Step 3

Return the pan to the air fryer and cook until onion is translucent and tender, about 5 minutes.

Step 4

Meanwhile, roughly chop 1/2 of the spinach and place in a bowl with eggs, Greek yogurt, and black pepper; whisk to combine. Pour egg mixture into the cake pan and lightly mix with the cooked vegetables. Set aside remaining unchopped spinach leaves.

Step 5

Cook frittata in the air fryer until browned on top and no longer jiggly in the center, about 18 minutes. Remove from the air fryer and let cool for 5 minutes.

Step 6

Remove frittata from the cake pan. Sprinkle with pepper flakes and serve over remaining spinach leaves.