Which dish features a creamy white sauce baked in a pastry shell?

The dish that features a creamy white sauce baked in a pastry shell is Chicken Pot Pie. This classic comfort food is characterized by its flaky crust that encases a rich filling, typically containing chicken and vegetables, all combined in a creamy white sauce. The cooking process involves baking it, which allows the pastry to become golden and crisp while the filling becomes warm and flavorful. Other dishes listed do not share this specific preparation with a pastry shell and creamy filling: Rotisserie Chicken is usually cooked without a crust and served as a whole chicken; the Big Memphis BBQ Sandwich focuses on BBQ flavors between bread; and Grilled Salmon is usually prepared simply grilled or seasoned without a pastry component. Thus, Chicken Pot Pie is the standout option due to its unique characteristics.