Place the chicken breasts in the bowl of a slow cooker. In a small bowl mix together the bbq sauce, red pepper flakes, garlic powder, brown sugar, and vinegar.
Cook on LOW for 40-5 hours. Once the chicken is done cooking drain the juice from the bowl and shred the chicken.
To make the quesadilla, lightly brush a tortilla with butter and place in a large skillet.
Sprinkle with cheddar cheese and add the BBQ chicken. Cover with another tortilla and brush with butter.
Cook the quesadilla till the tortilla is lightly browned. flip and continue till the tortilla is browned on the other side.
Remove from the skillet and cut into wedges. Serve with salsa and sour cream.
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