They are also known as microwave cakes. In a world of foams they are solid foams. Pastry chefs describe them as a sponge with delicate and feathery texture. You need a blender, a whipping siphon, a microwave, and 10 minutes of time to make them.
What we call brioche is a bread highly enriched with milk, eggs, and butter. The more eggs and butter in the ratio, the puffier the bread, the more tender its crumb, the longer it stays fresh and soft (read it as moist). Similar dough recipes exist in many cuisines and have different uses. Differently shaped and cooked, brioche is loved all over the world. Alsatian brioche can be less sweet and served with foie gras and Riesling and can be sweeter and served as a dessert with coffee.