Combine vegetables and 1/4 cup salad dressing; mix lightly. Loosen skin of each chicken breast to form a pocket; fill with vegetable mixture. Close opening with wooden pick. Brush chicken with 1/4 cup salad dressing;coat with crumbs. Place in 12 x 8" baking dish. Bake @ 350 degrees for 55 minutes or until tender. Combine process cheese spread, salad dressing and milk in a saucepan; stir over low heat until cheese is melted. Stir in zucchini; serve over chicken.