1Heat oven to 450°. Pat excess moisture from thawed drummettes, using paper towels; place drummettes in large bowl. Drizzle 2 tablespoons of the melted butter over drummettes. Sprinkle with flour; toss to mix. (Mixture will be crumbly.)
2Arrange drummettes in single layer in ungreased rectangular pan, 15 1/2x10 1/2x1 inch. Bake 40 to 45 minutes or until crisp and brown.
3Transfer browned drummettes to 4- to 6-quart slow cooker, using slotted spoon. Mix remaining 1 tablespoon butter, the hoisin sauce and chili-garlic sauce. Pour over drummettes; toss lightly to coat.
4Cover and cook on low heat setting 1 to 2 hours or until juice of drummettes is no longer pink when centers of thickest pieces are cut. Drummettes will hold on low heat setting up to 2 hours.