Heat oven to 450°F. With paper towels, pat excess moisture from thawed drummettes. In large bowl, place drummettes. Drizzle with 2 tablespoons melted butter. Sprinkle with flour; toss to mix. (Mixture will be crumbly.) Transfer mixture to ungreased 15x10x1-inch baking pan, arranging drummettes in single layer.
Bake for 40 to 45 minutes or until crisp and brown.
With slotted spoon, transfer browned drummettes to 4 to 6-quart slow cooker. In small bowl, combine all sauce ingredients; mix well. Pour sauce over drummettes; toss lightly to coat with sauce.
Cover; cook on low setting for 1 to 2 hours.