Chicken Pot Pie with Puff Pastry - Faxo

Ingredients

• 1/4 c. butter
• 1 small yellow onion, chopped small, about 1 c.
• 2 cloves garlic, minced
• 1/2 c. celery sliced very thin, from about 2 stalks
• 1/3 c. all-purpose flour
• 1 1/2 c. chicken broth
• 1 c. milk
• 1/2 t. kosher salt
• 1/4 t. black pepper
• 1/4 t. celery seed
• 4 c. cooked chicken or turkey, diced into ½-inch pieces
• 2 c. frozen mixed vegetables
• 1 T. fresh rosemary, minced
• 1 T. fresh Italian parsley, minced
• 1 sheet frozen puff pastry, thawed