2 lbs. hamburger
1 small onion, chopped
1 jar taco sauce
taco seasoning
1 tub sour cream (16 oz.)
1 - 2 pkg. shredded cheddar cheese

Brown hamburger with onion. Drain. Mix in taco seasoning according to package directions. Spread in 13 x 9 inch baking dish. Layer with sour cream taco sauce, and top with cheese.

Bake at 350°F until cheese is melted.