Mushroom, Cheese and Onion Quiche 1 fried onion 1 large can mushrooms (or fresh sauteed mushrooms) 5 oz. shredded cheese 2 eggs 1/2 cup milk 1/2 tbsp. salt 1/2 cup flour 1/2 tbsp. baking powder pepper to taste pie shell Prebake pie shell at 350 for 10 minutes. Apply layers of mushrooms, onions, and cheese. Mix eggs, milk, salt, flour, baking powder, and pepper; pour on top of pie. Bake 45 minutes at 350.