Prep the slow cooker base: Add the onion, garlic, black beans, corn, diced tomatoes, salsa, chicken broth, and tomato paste to the slow cooker. Stir to combine.
Season: In a small bowl, mix chili powder, cumin, smoked paprika, oregano, salt, and pepper.
Sprinkle the mixture over the chicken on both sides.
Add the chicken: Nestle the seasoned chicken into the sauce mixture in the slow cooker, submerging it slightly.
Cook low and slow: Cover and cook on Low for 4–6 hours or High for 2.5–3.5 hours, until the chicken is cooked through and shreds easily.
Shred the chicken: Transfer the chicken to a cutting board and shred with two forks. Return the chicken to the slow cooker and stir. Add lime juice and adjust salt to taste.
Cook the rice: While the chicken finishes, cook your rice according to package directions.
For extra flavor, use broth instead of water.
Assemble bowls: Spoon rice into bowls. Top with the chicken mixture and add your favorite toppings. Finish with fresh cilantro.
Serve: Add a squeeze of lime and a drizzle of hot sauce for a final punch of brightness and heat.