Spinach Souffle - cooking recipe

Ingredients

2 pkg. Stouffer's spinach souffle
4 eggs
6 Tbsp. milk
4 tsp. chopped onion
1/2 to 1 c. sliced mushrooms
3/4 c. grated Swiss cheese
3/4 to 1 c. cooked, crumbled sausage (optional)

Preparation

Thaw spinach souffle.
Combine remaining ingredients.
Place in greased baking dish (9 x 13-inch or 10 x 17-inch).
Bake at 400\u00b0 until knife inserted in center comes out clean (25 to 30 minutes).