Preheat oven to 350 degrees Fahrenheit.
In a medium bowl, mix all ingredients until smooth. Pour batter into a 9-inch oiled and parchment-lined cake pan. Bake at 350 degrees until the cake shrinks slightly from the sides of the pan and a toothpick inserted in the center comes out clean, about 35 minutes.
Cool for 5 minutes in pan, then remove from pan and cool on a wire rack. When cake is cool, frost with ganache. Refrigerate for an least one hour before serving.