Impossible Cheeseburger Pie
["1 lb. ground beef", "1 1/2 c. chopped onion", "1/2 tsp. salt", "1/4 tsp. pepper", "1 1/2 c. milk", "3/4 c. Bisquick baking mix", "3 eggs", "2 tomatoes, sliced", "1 c. shredded Cheddar cheese or processed American cheese"]
["Heat oven to 400\u00b0.", "Grease a 10 x 1 1/2-inch pie plate.", "Brown beef and onion; drain.", "Stir in salt and pepper.", "Spread in pie plate.", "Beat milk, Bisquick and eggs until smooth, 15 seconds in blender or 1 minute on high with hand mixer.", "Pour over meat mixture in pie plate.", "Bake for 30 to 35 minutes, or until knife inserted comes out clean.", "Cool 5 minutes.", "Cut into 6 to 8 servings."]
["ground beef", "onion", "salt", "pepper", "milk", "Bisquick baking mix", "eggs", "tomatoes", "Cheddar cheese"]