01 - Combine shredded chicken with chili powder, cumin, garlic powder, salt, and lime juice in a mixing bowl. Mix well to ensure even coating and set aside.
02 - Heat refried beans in a small saucepan over medium heat until smooth and spreadable, stirring occasionally to prevent sticking.
03 - Arrange tostada shells on a serving platter. Spread a thin, even layer of warm refried beans onto each shell using a spoon or spatula.
04 - Distribute the seasoned shredded chicken evenly over the bean layer. Top with shredded lettuce, diced tomatoes, and red onion.
05 - Garnish with shredded cheese, sour cream, cilantro, jalapeño slices, and avocado. Serve immediately with lime wedges on the side.