This butter cake from Brittany is easy to make with a food processor, an electric mixer, or completely by hand. I’ve written complete directions for all three methods. If using unsalted butter instead of salted, add 1/2 teaspoon salt to the dry ingredients. You’ll need an 8 x 2-inch round metal pan. If you have an 8-inch layer cake pan it will work perfectly. The vanilla in the recipe is my addition.