Air-Fryer Egg and Onion Frittata

1.Preheat your air fryer to 350°F (175°C) for about 5 minutes.

2.Heat the olive oil in a medium skillet over medium heat.

3.Add the thinly sliced onion to the skillet and cook, stirring occasionally, until the onions are soft and caramelized, about 15 minutes. Reduce heat if onions start to brown too quickly.

4.While the onions cook, crack the eggs into a mixing bowl.

5.Add salt, black pepper, and grated Parmesan cheese (if using) to the eggs.

6.Whisk the eggs thoroughly until the mixture is smooth and slightly frothy.

7.Once the onions are caramelized, remove them from heat and let them cool slightly.

8.Lightly grease an air fryer-safe round baking dish or small cake pan with non-stick cooking spray or olive oil.

9.Spread the caramelized onions evenly in the bottom of the prepared pan.

10.Pour the whisked eggs over the onions, ensuring an even layer.

11.Place the pan carefully into the preheated air fryer basket.

12.Cook the frittata at 350°F (175°C) for 12-15 minutes, or until the eggs are set and a toothpick inserted into the center comes out clean.

13.Carefully remove the pan from the air fryer and let the frittata rest for 2 minutes before slicing.

14.Slice into wedges and serve warm for breakfast or brunch.