Freezer-to-Slow Cooker Chicken Chili

Name: Freezer-to-Slow Cooker Chicken Chili
Cuisine: Latin American, American, Mexican
Ingredients: 1 medium yellow onion (one cup), chopped; 15oz can black beans, drained and rinsed; 15oz can cannellini beans (white kidney beans), drained and rinsed; 14.5oz can diced tomatoes with green chilies, undrained (my family likes medium-heat); 14.5oz can petite diced tomatoes, undrained; 1 cup frozen medley of green and red peppers and onion strips; 1 2/3 cup frozen corn; 4 cloves garlic, minced; 1 tablespoon paprika; 3 teaspoons chili powder; 2 teaspoons ground cumin; 1 1/2 teaspoons oregano; 1/4 teaspoon crushed red pepper flakes; 1 pound boneless, skinless chicken breasts, cut into 1-inch pieces