Chicken and Cheese Sliders

Name: Chicken and Cheese Sliders
Ingredients: Vegetable oil cooking spray; 1 green bell pepper, chopped; 1/2 medium red onion, chopped; 2 cloves garlic, chopped; 1 bone-in skinless chicken breast (about 6 ounces); 1/2 cup store-bought barbecue sauce; 1/4 can (7 ounces) chipotle peppers in adobo sauce; 8 small whole-wheat buns (such as Pepperidge Farm Wheat Sliders); 1/2 cup grated aged cheddar; 8 cherry tomatoes, sliced; 2 cups sprouts (such as arugula or broccoli)