Preheat oven to 175C.

Spray loaf tin with non-stick spray.

In a large bowl, sift baking powder, cocoa powder, espresso powder, flour, and salt together.

Using your fingertips, rub orange zest and sugar together until moist.

Combine sugar and flour mixture with a whisk.

Then mix in eggs, oil, yogurt, vanilla extract, and orange juice until just combined.

Bake for 50 minutes at 175C or until skewer inserted comes out clean.

Allow to cool in tin for 10 minutes before removing it from loaf tin to cool completely.