Think of yogurt cake as the little black dress of French baking: an easy, everyday staple that always delights and pairs well with just about everything. With a golden exterior and moist, fluffy crumb, it’s the perfect cross between a pound cake and light sponge cake, an ultimate family favorite for any occasion. Why is yogurt cake so popular in France? Ask any French native and they’ll likely tell you that it was the very first thing they ever learned how to bake. There’s a good explanation for that: During the final year of French kindergarten, usually when kids are around the age of 5 or 6, they learn to make it together with their class. The lesson starts with the teacher showcasing a 4- or 6-pack of individual plain yogurt cups. Then comes the fun. The empty cups, each 4 ounces, become the measuring tools for all of the other …