Preheat oven to 180°C. Grease and line a 24cm x 14cm loaf tin with baking paper, allowing the paper to come over the edges of the tin for easy removal of the cake once cooked. Combine the flour, baking powder, salt and macadamias in a bowl. In another bowl, whisk together the egg, sugar, yoghurt, macadamia oil, lime zest and juice. Pour over the dry ingredients and stir to combine.