Towering Tostadas

Ingredients

• 4 (5-inch) corn tortillas
• Olive oil-flavored cooking spray
• 1 (16-ounce) can fat-free refried beans
• 2 cups shredded lettuce
• 2 tablespoons finely chopped green onions
• 1 tablespoon chopped fresh cilantro
• 1/3 cup (1.3 ounces) preshredded 2% reduced-fat Mexican blend cheese
• 1 orange or green bell pepper, seeded and thinly cut into 12 rings
• 1/2 avocado, peeled and cut into 8 slices
• 1/2 cup pico de gallo (such as Goya)
• 1/4 cup fat-free sour cream
• 2 tablespoons roasted pepitas
• Lime wedges (optional)