1 lb. ground beef
1 med. onion, chopped
1 (1 1/4 oz.) pkg. taco seasoning mix
3/4 c. water
1 (16 oz.) can refried beans
1 (8 oz.) jar taco sauce, divided
1 baked 9-inch pastry shell
1 c. crushed corn chips
2 c. (8 oz.) shredded cheddar cheese, divided
Shredded lettuce
Chopped tomato

Cook ground beef and onion in a skillet until meat is browned, stirring to crumble meat; drain. Add taco seasoning mix and water, stirring well. Bring to a boil; reduce heat and simmer 20 minutes, stirring occasionally.

Combine refried beans and 1/2 cup taco sauce. Spoon half of bean mixture in bottom of pastry shell. Top with half of meat mixture, half of cheese, and all of corn chips.

Repeat layers with remaining bean mixture, meat mixture, and cheese. Bake at 400 degrees for 20-25 minutes. Top with lettuce and tomato.