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In a medium bowl, whisk together eggs, half and half, salt and pepper. Set aside.
Heat oil in a cast iron skillet and cook onions until tender but not do let them brown. Stir in spinach and tomatoes, but do not sauté. Top with crumbled feta cheese.
Immediately add egg mixture - DO NOT STIR.
Cook over medium-high heat until the sides begin to set and the edges may even begin to brown for about 5 minutes.
Transfer to the center rack of the oven and bake for about 8 - 10 minutes at 350º Fahrenheit.
The center should be jiggly but not liquid. After it is removed from the oven, the frittata will continue cooking slightly. Let the frittata cool for 5 minutes. Serve and enjoy.