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Preheat oven to 375 degrees.
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Chop onion, tomatoes, mushrooms, basil and oregano. Set aside.
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In medium bowl, crack eggs and whisk together with milk.
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Heat a large frying pan at medium heat. Add 2 tablespoons of oil and coat the bottom of the pan.
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Add eggs and then add the chopped vegetables, cheeses and herbs.
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Cook until bottom starts to set.
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Once set, bake in 375 degree oven for 15-18 minutes until frittata is firm.
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Remove from oven and let set for a few minute.
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Take a spatula and loosen frittata around side of the pan.
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Slide out onto a cutting board or large round serving dish. Cut into 8 slices.