Cook the chicken: place it in the pot of the slow cooker along with the diced tomatoes (with juice), chicken broth, spices, salt, and pepper to taste. Cook on low for three hours.
Stir in the beans, rice, and frozen corn. Cook for three more hours.
Once the rice is cooked, remove the chicken breasts and shred them. You can then serve them over the rice, or mix them into the rice and serve everything together.
Top with your favorite toppings like shredded cheese, lettuce, sour cream, pico de gallo, and guacamole.