Mushrooms Florentine
["1 lb. mushrooms", "2 Tbsp. butter", "2 pkg. frozen spinach", "1/2 tsp. salt", "1/4 c. onion", "1 1/2 c. grated cheese", "garlic salt"]
["Combine and bake at 350\u00b0 for 30 minutes."]
["mushrooms", "butter", "frozen spinach", "salt", "onion", "grated cheese", "garlic"]