Puff Pastry Chicken Pot Pie

Ingredients (12)

• ✓ 1 (17.5 ounce) package frozen puff pastry, thawed
• + ⅓ cup butter add to pantry
• + ½ medium onion, chopped add to pantry
• + 1 stalk celery, sliced add to pantry
• + ⅓ cup flour add to pantry
• + 1 teaspoon salt add to pantry
• + ½ teaspoon ground black pepper add to pantry
• + ½ teaspoon celery seed add to pantry
• + 1 cup milk add to pantry
• + 2 cups chicken broth add to pantry
• + 1 pound cooked chicken breast, cubed add to pantry
• + 1 (12 ounce) package frozen mixed vegetables add to pantry