1. Spray circular dish (approximately five inch diameter) with a non stick grease spray.
2. Beat the eggs and pour them into a dish.
3. Sprinkle mushrooms, onions, peppers, and ham throughout egg mixture.
4. After cooking, remove from oven, work omelet away from dish with spatula and fold in half.
5. Sprinkle shredded cheese over the top evenly and allow melting.