Preheat oven at 350 F. Grease cake pan with butter.
Combine yoghurt, sugar, eggs, vanilla and oil. Beat with a mixer until smooth.
In a separate bowl, sift flour, baking powder and Hojicha powder.
Incorporate the dry ingredients to wet mixture by batches, mixing well.
Pour batter into cake pan and bake for 40-45 minutes, until a toothpick inserted in the center comes out clean. Let cool for 10 minutes before removing from cake pan.