Which of the following is NOT considered a baked custard?

Panna cotta is not considered a baked custard because it is a dessert that is set using gelatin rather than being baked in the oven. It typically consists of sweetened cream that is thickened, chilled, and served as a smooth, creamy custard-like dessert but does not undergo the baking process that characterizes baked custards.

In contrast, the other options—flan, crème brûlée, and quiche—are all examples of baked custards. Flan is a dessert that combines eggs, milk, and sugar and is baked in a caramel-lined dish. Crème brûlée also combines eggs, cream, and sugar, and is baked until it sets, then finished with a layer of caramelized sugar on top. Quiche is a savory custard that includes eggs and milk or cream, often mixed with various fillings and baked in a crust. Thus, these items share the common feature of being subjected to the baking process, which distinguishes them from panna cotta.