First, place the riblets in the crock pot. If you're using onions and peppers, you can add them now as well.
In a separate bowl, mix together the BBQ sauce, brown sugar, apple cider vinegar, Worcestershire sauce, garlic powder, salt, and black pepper.
Pour the sauce over the riblets in the crock pot, making sure to coat them evenly.
Cover the crock pot and cook on low for 6-8 hours or on high for 3-4 hours. The riblets should be tender and falling off the bone when they're done.
Once the riblets are done, you can serve them as is, or you can place them on a baking sheet and broil them in the oven for a few minutes to caramelize the sauce and crisp up the edges.
Enjoy your delicious and easy crock pot riblets!