Preheat oven to 150°C.
Powder sugar until fine.
In a bowl, take butter and whip t for a minute until pale.
Add the powdered sugar and whip them together for five minutes until fluffy.
Now add eggs one at a time beating for a minute before adding the next.
Once the eggs are incorporated, remove the beater.
Sift the wheat flour twice or fluff it up with a whisk to incorporate air.
Add it in two batches and gently cut and fold the ingredients together with a spatula.
Grease, line a 6 1/2" * 2" loaf tin and pour the batter into it.
Bake in preheated oven for 40 minutes or until a tooth pick inserted comes out clean.
Tent the cake with a piece of foil if it browns too fast.
Allow the cake to cool for five minutes.
Flip it onto a wire rack and cool completely before slicing.