A custard-filled doughnut is a sweet pastry that features a soft, fried outer layer, typically made from a dough enriched with eggs and milk. The doughnut is often coated in powdered sugar or glaze, adding to its sweetness. Inside, it is filled with a creamy custard made from milk, sugar, and egg yolks, which gives it a rich and smooth texture. These doughnuts are popular in many cultures and can be found in bakeries and cafes around the world. They are often enjoyed as a dessert or a treat with coffee or tea, making them a delightful indulgence for many.