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Everyone loves this - even my two small children. Once cooked, it can be refrigerated and reheated. This has become a breakfast tradition for the holidays.
- Preheat to 325°F
- Beat eggs, butter, sour cream, milk, salt, and basil.
- Stir in cheese, mushrooms, onions, and tomato.
- Pour into 9x13 dish, cook uncovered until omelet is set but moist - about 40-45 minutes. After 30 minutes, stir so the ingredients are evenly distributed to the outer parts of the dish (they tend to float to the center).
- This can be made 24 hours in advance. Cook for 50-55 at 325°F if refrigerated.