Layer the base: Add onion, garlic, salsa, tomato sauce, and chicken broth to the crockpot. Stir in cumin, oregano, chipotle or smoked paprika, 1 teaspoon salt, and a few grinds of pepper.
Add chicken: Nestle the chicken breasts or thighs into the sauce so they’re mostly submerged.
Cook low and slow: Cover and cook on Low for 4–6 hours (best for tenderness) or on High for 2.5–3.5 hours, until the chicken shreds easily with two forks.
Add beans and corn: About 30 minutes before serving, stir in the black beans and corn.
Taste and adjust seasoning—add more salt, pepper, or chipotle for heat.
Shred the chicken: Remove the chicken to a cutting board and shred with two forks. Return the chicken to the crockpot and stir to coat in sauce.
Finish with lime: Squeeze in the juice of 1 lime. This brightens the flavors.
Add more to taste.
Build your bowls: Spoon chicken mixture over warm rice. Top with cheese, avocado, pico, sour cream, cilantro, jalapeños—whatever you like. A drizzle of hot sauce is great here.