Veggie Loaded Frittata

Dice the onion. Heat an oven safe skillet over medium heat. Add olive oil and the onion. Sauté for a few minutes then add in the tomatoes and mushrooms. Sauté until the mushrooms look almost done (about 5 minutes). Then add in spinach and cook another minute. Preheat oven to 400F. In a large bowl, whisk the eggs. Add salt, pepper, and garlic powder. Mix together. Pour the eggs onto the veggies and mix it together a little. Cook on the stovetop for 5 minutes. Then add to the oven and cook another 6-7 minutes, until the eggs look done in the center. Remove and let cool 10 minutes on the stove (it cooks a little more). Remove and serve!