Pre-heat oven to 350°F.
In a medium blow, combine sausage, onion, peppers and mushrooms.
In a separate bowl, mix eggs, sour cream and cheese.
Once egg mixture is thoroughly mixed, add in sausage and veggies.
Spread out into a greased 9 x 13-inch casserole dish.
Bake for 30 - 45 minutes or until cooked through.