In a medium bowl, combine the melted butter, agave nectar, mustard, curry powder and cayenne powder; mix well. Place chicken in a 9 x 13-inch baking pan and pour honey-mustard mixture over chicken. Cover and place in refrigerator. Marinate for at least 4 hours or overnight.
Preheat oven to 375°F. Remove pan from refrigerator and bake, covered, for 10 minutes. Remove cover; baste with sauce from pan, and bake about 10 minutes or more, or until done and juices run clear (baking time will depend a little on how thick your chicken breasts are). Makes 4 servings.
Approximate Nutrient Analysis per serving:
400 calories, 170 g fat, 10 g saturated fat, 150 mg cholesterol, 400 mg sodium, 22 g carbohydrate, 2 g fiber, 21 g sugar, 40 g protein