Impossible Taco Pie
["1 lb. ground beef", "1/2 c. chopped onion", "2 envelopes taco seasoning mix", "3/4 c. Bisquick", "1 1/4 c. milk", "3 eggs", "1 c. shredded Cheddar cheese", "1/4 head lettuce, shredded", "1 tomato", "1/3 c. sliced ripe olives"]
["Heat oven to 400\u00b0.", "Grease square baking dish, 8 x 8 x 2-inch. Cook and stir ground beef and onion in 10-inch skillet until beef is brown.", "Drain and stir in seasoning mix.", "Spoon into baking dish."]
["ground beef", "onion", "taco", "Bisquick", "milk", "eggs", "Cheddar cheese", "head lettuce", "tomato", "olives"]