1 lb. hamburger
1 onion
2 pkg. taco season mix
3/4 c. Bisquick mix
1 1/4 c. milk
3 eggs

Brown hamburger with onion. Follow directions on taco seasoning mix, cook down. Spread in bottom of cake pan. Mix the rest of ingredients and pour over meat. It will be very runny. Bake at 350 degrees for 20 to 30 minutes. Serve upside down and put on favorite taco fixings.