1 med. onion, chopped
4 chicken breast halves, boned & skin removed
Dijon mustard
2 med. zucchini, sliced
1/2 lb. mushrooms, sliced
3 tbsp. butter
3/4 tsp. basil
1/8 tsp. garlic powder
1/8 tsp. paprika

Preheat oven to 450 degrees. Place each breast on separate square of tin foil. Spread Dijon on each breast and place other ingredients on top of each breast. Fold foil to make "tent". Place packets on cookie sheet. Bake 25 minutes, top with grated Parmesan cheese.