1 pkg. Stouffer's spinach souffle, thawed
2 eggs
3 tbsp. milk
2 tsp. chopped onions
1 can mushrooms
1 (16 oz.) pkg. sausage, cooked and crumbled
3/4 c. grated Swiss cheese
1 deep dish pie crust

Mix all together. Pour into unbaked pie shell and bake at 400 degrees for 25 to 30 minutes. Let set 5 to 10 minutes before cutting.