Veggie Tostadas

Ingredients:2 (10-inch) 98% fat-free flour tortillas1 (16-ounce) can fat-free refried beans2 tablespoons enchilada sauce2 cups gourmet salad greens, divided1 cup diced plum tomato, divided1/4 cup chopped green onions, divided2 tablespoons sliced ripe olives, divided1 peeled avocado, cut into 12 wedges, divided1 tablespoon finely chopped bottled jalapeño pepper, divided1/4 cup (1 ounce) crumbled reduced-fat feta cheese,…