Taco Pie

1 lb. lean ground beef
1/2 c. chopped onion
2 pkgs taco seasoning.  (I make my own mix or use Spicely Taco Seasoning)  Ortega claims to be GF but we only buy products marked GF)
3/4 c Bisquick baking mix Gluten Free
1 1/4 c milk
3 eggs
1 c shredded cheddar cheese
1/4 head lettuce
1 tomato diced
1/3 c sliced black olives (I hate olives so I omit this)
Sour Cream

Heat oven 400*.  Grease 8x8x2 baking dish.  Cook & stir ground beef & onions in skillet until brown. Drain.  Stir in seasoning mix & let cool.   Beat Bisquick, milk & eggs with wish or beater until smooth.  Pour into greased baking dish.  Spoon ground beef over it & bake 25 min.  Then sprinkle with cheese.   bake until cheese melts.  about 2 min.  Cool 5 min.  Garnish with lettuce, tomato, olives & sour cream.