This 12 minute, dairy free, gluten free high protein frittata is a great way to start the day. With eggs, egg whites, spinach, tomatoes, and onion, you'll have all the ingredients to make this filling breakfast at home.
Generously coat an 8 inch cast iron skillet with cooking spray or oil. Cook onion and the diced half of the tomato for 3-4 minutes, or until soft.
Add more cooking spray. Add the spinach and cook 2-3 minutes until wilted.
Whisk the egg and egg whites in a bowl, and pour over the veggies.
Without stirring, let the eggs cook on the stove top until it is almost set (the bottom is cooked an almost cooked through to the top, with the top being still a bit wet. 3-4 minutes.
Top with sliced tomatoes. Put in oven on high broil for 2-3 minutes, or until top gets golden brown and cooked.
Remove from oven and slice into 4 pieces (quarters), and enjoy!