Tomato, mozzarella and spinach frittata.

This frittata is so easy to put together and is great hot or cold.

Ingredients: 

• 1 tbsp. olive oil.
• 1 medium sized onion,
• 3.5 ounces of cooked ham,
• handful of spinach
• 8 eggs (8 whites, 4 yolks)
• 3.5 ounces of mozzarella cheese,
• 5 cheryy tomatoes
• salt,pepper,basil to taste

Preparation: 

1. Preaheat the oven to 360°F (180°C )
2. Heat olive oil in a cast iron pan or oven-proof skillet over medium heat.
3. Add the onions and cook for 5 minutes, until softened
4.  Add the cooked ham and cook for 1 minute.
5. Add the spinach and cook for 2 minutes.
6. Pour the eggs over.
7. Scatter the mozzarella, tomatoes and basil on top.
8. Cook for 5 more minutes.
9. Transfer to the oven and bake for 10-15 minutes,