Preheat oven to 180°C. Grease a 17cm loaf tin with some butter and lightly dust the sides with flour before lining the base and sides with baking paper. Set aside.
Sift the flour and baking powder into a large mixing bowl and set aside.
In a separate mixing bowl, combine the caster sugar, Greek yogurt, eggs, blood orange zest, vanilla paste and olive oil. Whisk until combined.
Pour the wet mixture into the dry mixture and stir until a smooth batter forms.
Pour the batter into the prepared loaf tin and bake for 50 to 60 minutes. The cake is ready when it’s golden and a skewer inserted into the middle comes out clean.
Allow the cake to cool in the tin for 5 to 10 minutes before turning it out onto a wire rack to cool completely.
To make the glaze, add the icing sugar and blood orange juice to a mixing bowl and whisk until a smooth glaze forms.
When the cake is completely cool, drizzle or pour it all over the top, letting it drip down the sides. Serve as is or with berries and some sweetened crème fraiche.