Danish Creamery : Chicken Pot Pie

Ingredients

• 2 sticks (1 cup) Danish Creamery Butter, divided
• ¼ cup plus 2 Tablespoons all-purpose flour
• 5 cups unsalted chicken stock
• 1 pound baby potatoes, cut into ½-inch dice
• Kosher salt
• freshly ground black pepper
• 2 leeks, white and pale green parts only, halved, rinsed well and sliced
• 3 carrots, peeled and diced
• 3 stalks celery, diced
• 3 cups baby spinach
• 1 pound cooked chicken breasts, chopped
• 1 cup frozen peas
• ¼ cup chopped tarragon
• ¼ cup chopped fresh parsley
• 2 Tablespoons snipped chives
• 12 sheets thawed phyllo dough