In a bowl, whisk together the apple butter, bourbon, BBQ sauce, brown sugar, apple cider vinegar, Worcestershire, garlic powder, smoked paprika, and red pepper flakes.
Place the meatballs into the slow cooker and pour the sauce over them.
Stir well to coat every meatball.
Cook on LOW for 3 hours or HIGH for 2 hours, stirring halfway through.
Once the meatballs are glossy and sticky, serve warm as an appetizer or over mashed potatoes or rice.
Variations
Swap bourbon for rum or omit it entirely for a non-alcoholic version.
Add a teaspoon of Dijon mustard for tangy depth.
Use spicy BBQ sauce for a sweet-heat twist.
Stir in apple chunks during cooking for added texture and flavor.
Tips
Stir midway so the glaze coats evenly and thickens properly.
If the sauce becomes too thick, thin with a splash of apple cider or broth.
Finish with a splash of bourbon off heat to heighten aroma and richness.