Thanksgiving Pot Pie

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5 tablespoons all-purpose flour, plus additional for dusting

1 sheet frozen puff pastry, thawed 

Nonstick cooking spray, for the baking dish

5 tablespoons unsalted butter 

2 celery stalks, thinly sliced 

1 medium yellow onion, diced 

1 rotisserie turkey breast, shredded (about 4 cups) 

4 cups low-sodium chicken or turkey broth 

1 cup half-and-half 

1 cup shredded Brussels sprouts 

1 cup stuffing mix 

1 teaspoon kosher salt 

1/2 teaspoon freshly ground black pepper 

1/2 cup whole cranberry sauce 

1 large egg, whisked