Karamelliserad lök, röd paprika och zucchini-frittata

👩‍🍳 Gör så här

1. 1
   Preheat oven to 400F. Over medium-low heat, heat oil in a 10-inch skillet. Stir in onion and cook until slightly brown, about 10 minutes. Add peppers and cook 5 more minutes, then add zucchini. Season with salt and pepper and cook 3 more minutes stirring occasionally.
2. 2
   In a medium bowl whisk eggs, Parmesan, salt and pepper.
3. 3
   Add eggs to the skillet making sure eggs cover all the vegetables. When the edges begin to set (about 2 minutes) move skillet to oven.
4. 4
   Cook about 10-15 minutes, or until frittata is completely cooked.
5. 5
   Serve warm, cut into 4 pieces.