1 box frozen spinach, thawed, drained
1 can cream of mushroom soup
1/4 c. butter, melted
1 tbsp. onion
1 egg, beaten
1 c. croutons
1/2 c. Sharp Cheddar cheese, shredded
1/4 c. Parmesan cheese

Mix all ingredients together. Place in greased casserole. Top with croutons and cheese. Bake at 350 degrees for 30 minutes.