Nina's Spinach Casserole

1 pkg frozen spinach
1/2 lb feta or sharp cheddar
1 pt cottage cheese
4 eggs
6 tbsp flour
1/2 tsp salt
1/4 tsp pepper
2 tbsp butter
8 oz mushrooms (fresh)

Thaw & drain spinach, preheat oven 350.
Crumble cheeses and mix together with spinach.
Add mushrooms (sautéed).
Separately mix eggs, flour, salt & pepper.
Combine both mixtures.

Bake in greased pan 9" square for 1 hour
or till top is slightly brown.