Turkey Pot Pie

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1 package puff pastry, thawed

1 tablespoon all-purpose flour, plus more for dusting

3 tablespoons unsalted butter

1/2 cup peeled and chopped carrots

1/2 cup chopped celery

1/2 yellow onion, chopped

1 1/4 cups low-sodium chicken broth

1/2 cup whole milk

1 1/2 cups leftover turkey, roughly chopped

1/2 cup frozen petite peas

1/4 teaspoon celery seed

Kosher salt and freshly cracked black pepper

1 large egg, beaten