Coffee cake is a cake, often sponge cake, which is made with coffee or has a coffee flavour. In other definition coffee cake is a class of cakes intended to be served with coffee or for similar breaks and snacks.
Coffee cake (also sometimes known as Kuchen or Gugelhupf) was not invented. It evolved from ancient honey cakes to simple French galettes to medieval fruitcakes to sweet yeast rolls to Danish, cakes made with coffee to mass-produced pre-packaged treats.
Food historians generally agree the concept of coffee cake (eating sweet cakes with coffee) most likely originated in Northern/Central Europe sometime in the 17th century. These countries were already known for their traditional for sweet yeast breads. When coffee was introduced to Europe these cakes were a natural accompaniment. German, Dutch, and Scandinavian immigrants brought their coffee cake recipes with them to America.
The first coffee cake-type foods were more like bread than cake. They were simple concoctions of yeast, flour, eggs, sugar, nuts, dried fruit and sweet spices. Over time, coffee cake recipes changed. Sugared fruit, cheese, yogurt and other creamy fillings are often used in today's American coffee cake recipes. [source : Coffee Cakes]