Preheat the oven to 180°C (350 °F).
Sift and combine flour, salt, baking powder, and ½ cup sugar in a medium-sized bowl.
Rub orange zest with the remaining ¼ cup of sugar.
Add orange zest and sugar into the bowl of dry ingredients. Mix to combine.
In a separate bowl, combine yogurt and eggs. Whisk.
Add olive oil and whisk to combine.
Add and gently mix the dry ingredients in batches. Mix until thoroughly combined.
Grease your loaf pan with butter.
Pour the mixture into the greased pan and use a spatula to even the top of the cake mixture.
Place it on the lower half of the oven for 50 to 55 minutes, or until the top has turned golden.
Set aside for 20 mins to cool down.
Remove the cake from the pan (careful, the pan might still be hot).
Serve and sprinkle with powdered sugar, if desired.