Burrito Casserole

1 lb.ground beef
1/2 yellow onion, chopped
1 pkg. taco seasoning
Flour tortillas
1 can refried beans
2-3 cups shredded mild cheddar cheese
1 can cream of mushroom soup
1 ( 8 oz.) carton sour cream, divided 

Brown ground beef and onions, drain. Add taco seasoning.(Prepare as directed on taco seasoning package).
Add refried beans. Mix soup with 4 oz. of sour cream. Spread enough of sour cream mixture to cover bottom of casserole dish. Put meat into tortillas. Wrap like a burrito and place seam side down in dish. Put remaining sour cream on top of borritos. Sprinkle cheese over top and bake uncovered at 350 20-30 minutes. Garnish with chopped green onions, chopped tomatoes, remaining sour cream and picante sauce.