Mmmmm Impossible Taco Pie
["1 lb. ground beef", "1/2 c. chopped onions", "1 envelope taco seasoning mix", "1 can refried beans", "3/4 c. Bisquick", "1 1/4 c. milk", "3 eggs", "1 c. shredded cheese", "chopped tomatoes, lettuce, sour cream", "favorite taco sauce or salsa"]
["Cook ground beef, onions and seasoning mix together until meat turns color; drain.", "Put in a greased 8 x 8-inch square pan. Spread beans on top of meat.", "Mix Bisquick, milk and eggs; pour over beans.", "Bake at 400\u00b0 until brown.", "Sprinkle cheese on top and put back into oven until cheese is melted.", "Serve with remaining ingredients."]
["ground beef", "onions", "taco", "beans", "Bisquick", "milk", "eggs", "shredded cheese", "tomatoes", "favorite taco"]