Refried Bean Tostadas

Description
Beans, Refried Canned by the US Department of Agriculture, public domain government resource—original source of recipe
 * Serves: 10

Ingredients

 * 1 (15½ ounce) can refried beans
 * ¼ cup chopped onion
 * 1 package (1¼ ounce) taco seasoning mix
 * 1 (10-count) package tostada shells, warmed
 * 2 cups shredded lettuce
 * ½ cup shredded cheddar cheese
 * ⅓ cup sliced ripe olives (optional)
 * 2 medium ripe avocados, pitted, peeled and thinly sliced
 * Taco Sauce for accompaniment

Directions

 * 1) Combine beans, onion and seasoning mix in medium saucepan. Cook, stirring frequently, for 4 to 5 minutes or until heated through.
 * 2) Spread ¼ cup bean mixture over each shell.
 * 3) Top with lettuce, cheese, olives, avocado, and taco sauce.