1. Preheat oven to 250�F. Bake untopped tostada shells on baking sheet for 3 minutes.
2. Cook ground beef according to directions on Taco Seasoning Mix package; set aside.
3. Spread refried beans on each warmed tostada shell. Spoon on beef, and then top with cheese, lettuce, tomatoes, onion, and salsa according to taste.