In a medium bowl combine the melted butter/margarine .
curry powder and cayenne powder. Mix well. Place chicken breasts in a 9x13 inch baking dish and pour honey/mustard mixture over chicken. Cover and place in refrigerator. Marinate for at least 4 hours or overnight. .
Preheat oven to 375 degrees F (190 degrees C). .
Remove dish from refrigerator and bake .
in the preheated oven for 10 minutes. Remove cover and bake about 10 minutes more .
or until done and juices run clear (baking time will depend a little on how thick your chicken breasts are). .