Heat olive oil in a skillet over medium heat.
Add shredded chicken, chopped chipotle peppers, adobo sauce, garlic powder, onion powder, cumin, smoked paprika, salt, and black pepper.
Stir well and cook for 5 to 7 minutes until the chicken is heated through and well coated.
Warm the refried beans in a saucepan or microwave until smooth and spreadable.
Spread a layer of warm refried beans over each tostada shell.
Top each shell with a generous spoonful of chipotle chicken.
Add shredded lettuce, diced tomatoes, shredded cheese, avocado, red onion, and cilantro.
Drizzle sour cream over the top.
Serve with lime wedges on the side.
Enjoy immediately while the tostadas are still crisp.