Chicken in Lemon Sauce

This is one of Alan's favorite recipes from his sister. It is really really good. I hope that you guys like it too.

1/4 c. butter or margarine
4 whole chicken breasts, split, skinned, and boned
3 Tbsp. white grape juice concentrate
2 Tbsp. lemon juice
1/4 tsp. salt
1/8 tsp. white pepper
1 c. heavy cream
1/3 c. grated Parmesan cheese
1 c. sliced mushrooms

Melt butter in large skillet over medium heat; add chicken. Cook, turning, about 10 minutes or until chicken is brown and tender. Remove chicken to ovenproof serving dish. Discard butter from skillet. Add grape juice concetrate, lemon juice, salt, and pepper to skillet; cook and stir over medium heat 1 minute. Gradually pour in cream, stirring constantly, until hot; do not boil. Pour cream sauce over chicken; sprinkle with cheese and mushrooms. Broil chicken about 6 inches from heat source until lightly browned.