Becky's Gluten-Free Slow Cooker Chicken Vegetable Soup Recipe

1 (32 ounce) carton gluten-free chicken broth

1 pound skinless

boneless chicken thighs

1 (14.5 ounce) can fire-roasted diced tomatoes

1 onion

chopped

2 carrots

chopped

½ cup water

2 stalks celery

chopped

2 teaspoons minced garlic

1 teaspoon dried basil leaves

½ teaspoon salt

½ teaspoon ground black pepper

½ teaspoon red pepper flakes

1 cup frozen mixed vegetables

¼ cup uncooked long-grain rice