Impossible Spinach Pie
["1 pkg. 10 oz. frozen spinach, thawed and drained", "1 c. shredded Swiss cheese", "1/2 c. chopped onion", "1 1/2 c. milk", "3 eggs", "3/4 c. bisquick baking mix", "1 tsp. salt", "1/4 tsp. pepper", "1/4 tsp. ground nutmeg"]
["Heat oven to 375\u00b0.", "Grease pie plate.", "Mix spinach, cheese and onion in plate.", "Beat remaining ingredients until smooth. Pour into pie plate.", "Bake until a knife inserted in the center comes out clean.", "About 30 minutes.", "Cool 5 minutes."]
["frozen spinach", "Swiss cheese", "onion", "milk", "eggs", "bisquick baking mix", "salt", "pepper", "ground nutmeg"]