1. Preheat oven to 425 degrees.Arrange chicken in a 9 by 9 baking dish that has been.sprayed with nonstick coating. Mix mustard and garlic. Spread over chicken. 2. Scrub potato, grate and mix well with oil and lemon juice .Spread over chicken. 3. Sprinkle with pepper. Bake for 25 to 35 min. Until chicken is done and potatoes are golden. 4. Lemon juice is used to prevent the potatoes from turning gray.