1/2 (1-ounce) slice white bread  | 
                                                1/2 cup uncooked regular oats  | 
                                                2 cups chopped onion  | 
                                                1/2 cup ketchup, divided  | 
                                                1 teaspoon salt  | 
                                                2 teaspoons dried oregano  | 
                                                1 1/2 teaspoons ground cumin  | 
                                                1 1/2 teaspoons ground coriander  | 
                                                1/4 teaspoon ground red pepper  | 
                                                2 garlic cloves, minced  | 
                                                1 large egg, lightly beaten  | 
                                                1 1/4 pounds extra-lean ground beef  | 
                                                1/2 pound ground turkey breast  | 
                                                cooking spray  | 
                                                2 teaspoons minced chipotle pepper in adobo sauce  |