This was an old recipe I got from Plain Chicken several months ago, but I just got around to making it. It's a crowd pleaser, and it's pretty cheap to make, especially when ground beef is on sale.
I wasn't sure what size pie plate to use, but my small one still worked. It would be find to cook this in a 8"x8" glass dish, too.
I love all the shortcuts this recipe has. Use minced onion flakes instead of chopping and sauteing. Use taco seasoning instead of measuring out 6 different spices. Use Bisquick instead of measuring out various flours. Plus, anything that gets covered with cheese at the end is going to taste great. We ate it with Mexican rice. Very good!
Preheat oven to 400. Grease pie plate. Cook beef and onion until beef is brown, and drain. Stir in taco seasoning and salsa. Spread mixture into pie plate, and top with 1/4 cup cheese. Stir Bisquick, milk, and eggs until blended. Pour into pie plate. Bake for about 25 minutes. Sprinkle with remaining cheese, and bake for additional 3-5 minutes or until cheese is melted. Serve with salsa and sour cream.