Slow Cooker King Ranch Chicken Soup

Name: Slow Cooker King Ranch Chicken Soup
Prep time: 10 min
Cook time: 4 h
Total time: 4 h 10 min
Cuisine: American
Ingredients: 8 Tablespoons butter; 2 cloves garlic; 1/2 cup all-purpose flour; 4 cups low-sodium chicken broth; 4 teaspoons chili powder; 1 Tablespoon ground cumin; 1 Tablespoon garlic powder; 1 teaspoon salt; freshly ground black pepper (, to taste); 1 1/2 pounds boneless skinless chicken breasts; 10 ounce can diced tomatoes with green chilies; 1 medium fresh jalapeño pepper (, minced (seeds and membranes left intact for spicy, removed for mild)); 2 cups freshly grated sharp cheddar cheese ((or Mexican blend or Colby Jack cheese, plus more for serving)); tortilla chips (, for serving); fresh cilantro ((for serving, optiona), chopped)