Ingredients

• 1 cup prechopped onion
• 1 cup unsalted chicken stock (such as swanson)
• 1 tablespoon all-purpose flour
• 1 ½ tablespoons chili powder
• 2 teaspoons ground cumin
• ¾ teaspoon garlic powder
• ½ teaspoon crushed red pepper
• ¼ teaspoon salt
• 1 (15-ounce) can unsalted tomato sauce
• 3 cups shredded skinless, boneless rotisserie chicken breast (about 15 ounces)
• 1 (15-ounce) can unsalted black beans, rinsed and drained
• 12 (6-inch) corn tortillas
• cooking spray
• 3 ounces preshredded mexican-style four cheese blend (about 3/4 cup)
• 1 cup chopped tomato
• ¼ cup chopped fresh cilantro
• 6 tablespoons sour cream