Linkev's spinach ricotta frittata

This is one of my egg  frittata it has almost the same ingredients has the pizza frittata 
minus the sauce the good thing about the pizza frittata is that you can add  any kind of topping
like in a pizza, my kids and family love both of them.

Ingredients:

12 eggs
2 tablespoons water or milk
salt and black pepper to taste
1/2 cup of ricotta cheese 
6 to 8 slices of fresh mozzarella cheese or 
you can use 1 cup of shredded mozzarella cheese
1/2 cup of chopped fresh baby spinach
1 cup tomatoes chopped small
2 teaspoons plus one tablespoon olive oil
1 medium onion thinly sliced

Directions:
Preheat oven at 350°

In a large enough bowl beat the eggs add water or milk, salt and pepper to taste.
In a ovenproof 12-inch nonstick (If you don't have a ovenproof skillet, cover the handle very well with alluminum foil). heat 2 teaspoons olive oil over medium heat and saute' onions remove and set aside add one tablespoon of olive oil to the same skillet and heat over medium heat add the eggs, reduce heat to low cook for about 3 minutes then add the ricotta in teaspoonfuls all around the skillet, add the chopped spinach, onions and tomatoes, once you see that the eggs are set around the edges,(make sure you are not burning the bottom) then top with mozzarella cheese and tranfer in the oven and bake for about 12 minutes or until the eggs are cooked and mozzarella cheese is melted.