In a Dutch oven coated with cooking spray, saute onion until tender. In a small bowl, whisk flour and stock until smooth; gradually stir into Dutch oven. Bring to a boil; cook and stir 2 minutes or until thickened. Remove from heat. Add turkey, peas and carrots, potatoes, parsley, thyme and pepper; stir gently., Preheat oven to 425°. Divide turkey mixture among eight 10-oz. ramekins. On a lightly floured surface, unroll crust. Cut out eight 3-in. circles. Gently press parsley into crust if desired. Place over turkey mixture. Beat egg and water; brush over tops. Sprinkle with salt., Place ramekins on a baking sheet. Bake 20-25 minutes or until crusts are golden brown. Freeze option: Securely wrap baked and cooled potpies in plastic and foil; freeze. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Preheat oven to 425°. Unwrap potpies; bake in oven until heated through and a thermometer inserted in center reads 165°. Cover top with foil to prevent overbrowning if necessary.