1 lb. ground beef
3/4 to 1 c. chopped onions
15 oz. can refried beans
1 pkg. dry taco seasoning mix
1 c. sour cream
1 1/2 c. grated Mozzarella cheese

Brown ground beef and onions in skillet. Drain. Place meat and onions in slow cooker. Add beans and taco seasoning mix. Mix together well. Spread sour cream over mixture. Sprinkle cheese over top. Cover. Cook on low 1 1/2 hours or on high 3/4 hour. Serve warm from the cooker with tortilla chips.