Heat Olive Oil In A Skillet Or Frying Pan Over Medium-High Heat. Add Mushrooms, Onions And Peppers; Saute Until Onions Are Transparent. In A Mixing Bowl, Beat Together Eggs And Milk. Add Egg Mixture To Vegetables; Stir In Tomatoes. Cook Until Eggs Are Set. When Eggs Are Almost Done, Mix In Cheese. Serve Immediately.