Creamy White Chicken Chili

Name: Creamy White Chicken Chili
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: American
Ingredients: 1 tablespoon oil; 1 pound boneless skinless chicken breasts (cut into 1/2-inch pieces (leave whole for slow cooker method)); 1 medium chopped onion ((about 1/2 cup)); 1 1/2 teaspoons garlic powder or 2 cloves fresh garlic (finely minced); 2 cans (15.5-ounces each) Great Northern Beans (rinsed and drained); 1 (14.5) ounce can chicken broth ((about 1 3/4 cups)); 2 cans (4-ounces each) chopped green chiles (see note); 1 teaspoon salt; 1 teaspoon ground cumin; 1 teaspoon dried oregano; 1/2 teaspoon pepper; 1/4 teaspoon cayenne pepper; 1 cup sour cream; 1/2 cup whipping cream (see note); Fresh cilantro (for garnish (optional)); Shredded cheese (tortilla chips, other toppings (optional))