2½ pounds lean ground beef
1 cup chopped onions
2- 10¾ ounce cans condensed fiesta nacho cheese soup
¾ cup ketchup
16 hamburgers buns, split and toasted
1. In 12 inch skillet ground beef and onions over medium-high heat until meat is brown and onions are tender.
2. In 3½ or 4 quart slow cooker combine meat mixture soup and ketchup.
3. Cover and cook on low-heat setting for 4½ to 5 hours or on high-heat setting for 2½ to 3 hours.
4. Serve meat mixture on toasted bun.