01 - In a mixing bowl, combine shredded chicken with chili powder, cumin, garlic powder, salt, and lime juice. Mix thoroughly to ensure even coating.
02 - Warm refried beans in a small saucepan over medium heat until smooth and spreadable.
03 - Place tostada shells on a serving platter. Spread a thin layer of warm refried beans onto each shell.
04 - Top each shell with an even portion of the seasoned shredded chicken, followed by lettuce, tomatoes, and red onion.
05 - Sprinkle shredded cheese over the vegetables. Add a dollop of sour cream, then garnish with cilantro, jalapeño slices, and avocado.
06 - Serve immediately with lime wedges on the side for squeezing over the top.