Spinach Casserole - cooking recipe

Ingredients

2 boxes frozen chopped spinach, thawed
1 can cream of mushroom soup
1 can corn, drained
4 to 5 shiitake mushrooms, sliced
6 to 8 fresh mushrooms, chopped (I usually use the entire tub of mushrooms)
1/2 c. mayonnaise
2 egg whites

Preparation

Mix all ingredients together and bake at 350\u00b0 for 1 hour.