Directions1. Preheat your oven to 350°F. Lay out the tostada shells (or baked tortillas) on two rimmed baking sheets.
2. Combine the chicken and 1 cup of the barbecue sauce in a small bowl, and stir to coat.
3. Divide the chicken between the tostada shells and top with the cheese (about ¼ cup on each)
4. Bake for 6 to 8 minutes, just until the cheese is melted.
5. Remove from the oven and drizzle with the remaining ½ cup barbecue sauce. Sprinkle with green onions, if desired.