2 pounds lean ground beef
2 (1 1/4 ounce) envelopes taco seasoning mix
1 (16 ounce) can refried beans
1 (10 3/4 ounce) can condensed fiesta nacho cheese soup
1 (4.8 ounce) package tostada shells

In a large skillet cook ground meat until brown; drain off fat. Add taco seasoning mix to meat and continue according to package directions.

Transfer seasoned meat mixture to a 3 1/2 or 4 quart slow cooker. Stir in refried beans and soup.

Cover and cook on LOW for 3 to 4 hours or on HIGH for 1 1/2  to 2 hours.

Serve on tostada shells. Top with lettuce, tomatoes, sour cream and salsa.