In a bowl, combine the flour, baking powder, chocolate sprinkles and coconut flakes. Mix them together well.
In another bowl, beat the butter with the sugar. Add the yoghurt to them and stir. Pour the liquid ingredients into the dry ones and stir.
Pour the mixture into a form laid out with baking paper. Bake at 356°F (180 °C) for about 30-35 min.
Optionally, you can sprinkle it with coconut flakes and grated chocolate.