1 med. onion, sliced
4 boneless chicken breast halves, skin removed
Salt and pepper
Dijon mustard
2 med. zucchini or yellow squash, sliced 1/4-inch thick
1/2 lb. mushrooms, sliced
3 tbsp. butter
3/4 tsp. basil leaves, chopped
1 clove garlic, chopped
1/8 tsp. paprika
1/2 c. grated Parmesan cheese

Preheat oven to 400 degrees. Tear off four 12x18-inch squares of heavy duty aluminum foil. Divide ingredients into 4 parts on foil as follows: Place onion slices in center of lower half of each sheet of foil. Place chicken over onions; season with salt and pepper and spread lightly with mustard. Top with squash and mushrooms. Season vegetables with salt and pepper. Dot with butter; sprinkle with basil, garlic and paprika.

Fold top half of foil over food, meeting bottom edges of foil. Seal edges together making a tight 1/2-inch fold. Fold again, allowing space for heat circulation and expansion. Repeat to seal each side. Place foil packet on cookie sheet. Bake 18 minutes in preheated 400 degree oven. Foil packet will puff while cooking. To serve, transfer foil packet to dinner plate using pot holder or oven mitts. Cut an X in top of packet; fold back foil. Top each serving with cheese.