Egg ans Sausage Souffle

6 eggs, beaten slightly
2 cups milk
1 cup shredded cheddar cheese (4 oz)
1 packet Bisquick baking mix (1 cup)
1 tsp. dry mustard
1/2 tsp. dried oregano leaves
1 lb. bulk pork sausage, browned and drained

Mix all ingredients. Cover and refrigerate at least 8 hours.

Heat oven to 350. Grease 2 quart casserole. Pour mixture into casserole.

Bake until knife inserted in center comes out clean, about 1 hour.