01 - Preheat oven to 350°F. Arrange tostada shells on a baking sheet and warm for 5 minutes until crisp.
02 - In a medium saucepan over medium heat, combine shredded chicken, BBQ sauce, honey or brown sugar, and smoked paprika. Cook, stirring occasionally, until the chicken is heated through and evenly coated, about 5 minutes.
03 - Arrange the warmed tostada shells on serving plates. Divide the BBQ chicken evenly among each shell.
04 - Layer shredded lettuce, chopped tomatoes, sliced red onion, shredded cheese, avocado slices, and fresh cilantro over each tostada.
05 - Drizzle sour cream over the assembled tostadas. Add jalapeño slices and lime wedges if desired.
06 - Serve immediately while the shells are still crisp and the chicken is warm.