Nelda's Chicken Pot Pie

1 bag frozen peas and carrots
2 c. cooked chicken
1/2 c. milk
1/2 tsp. pepper
2 (10 3/4 oz.) cans cream of potato soup
puff pastry

Line 8x8 dish with puff pastry (spray dish first).  Mix all ingredients together and pour into pastry.  Cut another pastry sheet into strips and place on top.  Bake at 375 for about 50 minutes.