Individual Chicken Potpies

INGREDIENTS

• 8 Tbs. (1 stick) unsalted butter, cut into
• 1/2-inch cubes
• 1/2 cup all-purpose flour
• 4 cups chicken stock
• 1/2 tsp. chopped fresh thyme
• 1 bay leaf
• 1/2 cup chopped yellow onions
• 1/2 cup chopped celery
• 1/2 cup peeled and chopped carrots
• 1/2 cup chopped white button mushrooms
• 1/2 cup chopped red-skinned potatoes
• 1 cup chopped cooked chicken
• 1/2 cup cooked fresh or frozen peas
• Salt and freshly ground pepper, to taste
• Four 6-inch squares frozen puff pastry
• 1 egg, beaten with 1 tsp. water