Ham and Swiss Chicken in Pastry - Pepperidge Farm

Ingredients

• 1 tablespoon butter
• 1.25 pounds skinless, boneless chicken breast halves(4 chicken breast halves)
• 1 egg
• 1 tablespoon water
• 2 tablespoons all-purpose flour
• 1/2 of a 17.3-pounce package Pepperidge Farm® Puff Pastry Sheets(1 sheet), thawed
• 4 teaspoons Dijon-style mustard
• 4 slices (1 ounce each ) cooked deli ham
• 4 slices (1 ounce each ) Swiss cheese