Generously spray the inside of a 6-quart slow cooker with cooking spray.
Place the chicken thighs in the prepared slow cooker in an even layer.
Pour the salsa over the chicken.
Sprinkle chili powder, cumin, paprika, garlic powder, onion powder, dried oregano, salt, and pepper over the salsa and chicken.
Add the drained and rinsed black beans on top and stir gently to combine so the chicken is mostly submerged in the salsa.
Cover and cook on high for 210 minutes (3½ hours) to 300 minutes (5 hours), or on low for 240–360 minutes (4–6 hours), until the chicken shreds easily.
Turn off the slow cooker. Remove the chicken, discard any fat, and shred it with two forks or dice with a knife.
Return the shredded chicken to the slow cooker and stir to combine with the sauce. Taste and adjust seasoning if needed.
Serve over cooked rice and top with optional roasted corn and peppers and desired toppings from the serving suggestions.