Spray inside liner of slow cooker with non stick spray. Cut tops off bell peppers and remove the seeds, set aside.
In a bowl combine the ground beef, cooked rice, taco seasoning, garlic powder, drained can of black beans, 3/4 c of your cheese and 1 c of enchilada sauce. Stir together.
Use a small ice cream scoop or large Tbsp to scoop mixture to fill inside cavity of each bell pepper.
Put each one into Crockpot so they sit flat and set next to one another.
Cover with lid and cook on low for 4-6 hours or until thermometer reads 165 F when inserted into center of meat mixture.
Pour remaining enchilada sauce on top and add remaining cheese sprinkled on top of them all. Set lid on just so cheese melts and then serve.