Gram's Chicken Pot Pie Updated

I'm not sure when we had this but anything with puff pastry is worth having... of course.

1lb boneless, skinless chicken breast, cut into bite size pieces
2-3 tbsp of Zesty Italian dressing (Kraft)
2 c frozen mixed veggies (you can see mine had corn, carrots, peas, and grean beans)
1 10.75oz can of condensed cream of chicken soup
1/2 c milk
4oz Velveeta, chopped
1 sheet of defrosted puff pastry (1/2 of a 17.3oz package)
1 egg, beaten

Heat oven to 400 F.  In a large skillet over medium heat cook chicken in dressing until no longer pink.  Stir in vegetables and soup.  Cook additional 1-2 minutes.  Pour into a sprayed 2 1/2 quart baking dish.  Add milk and velveeta, stirring carefully.  Top with puff pastry, tucking edges inside, and brush with beaten egg.  Bake 30 mins or until golden brown.  Let stand for 5 minutes before serving.