What Is Boston Cream Filling Made Of?
Boston cream filling is a rich and creamy mixture that typically consists of milk, sugar, egg yolks, cornstarch, butter, and vanilla extract. Some variations may also include heavy cream or additional flavors such as chocolate or almond extract. The mixture is heated on the stovetop until it thickens and then chilled until it becomes a thick pastry cream consistency. It is commonly used as a filling for donuts, cakes, and pastries, particularly in the classic Boston cream pie dessert.