To your slow cooker add the ground beef, onion, bell peppers, chili seasoning, garlic, green chilies, chili beans, black beans, tomato sauce, cornstarch and sugar.
1 small onion, 1 green bell pepper, 1 red bell pepper, 1 ounce chili seasoning, 3 cloves garlic, 4 ounces diced green chiles, 15 ounces chili beans, 15 ounces black beans, 29 ounces tomato sauce, ½ Tablespoon cornstarch, ½ Tablespoon sugar