Chicken Breasts in Foil

4 chicken breast halves, boneless
1 tablespoon chopped green onion
2 tablespoons butter, melted
8 fresh mushrooms
2 tablespoons chopped fresh parsley
1/2 cup dry white wine
1/4 teaspoon garlic salt
1/8 teaspoon tarragon

Lightly oil one side of four pieces of foil. Sauté chicken and onions in butter until chicken is lightly browned, remove from heat. Lift chicken and onions from pan with slotted spoon, dividing evenly among pieces of foil. Place 2 mushrooms atop each. Sprinkle parsley over. Return skillet to heat. Add wine, stirring well to loosen any pan drippings. Add garlic salt and tarragon. Cook 3 minutes. Fold edges of foil upward to contain sauce. Spoon wine sauce over chicken. Fold edges tightly to seal. Bake at 350 for 30 minutes.