1. Preheat oven to 350 degrees Fahrenheit.
2. Slice the chicken on an angle to thin it out into cutlets.
3. Lay the cutlet with the skin underneath and place a heaping tablespoon of the squash mixture on top. Roll up and place in a baking pan, seam side down.
4. In a small bowl, combine duck sauce, water, soy sauce, mustard, garlic, and pepper. Pour over chicken.
5. Bake, uncovered, for one hour.