Preheat the oven to 175 degrees celsius (347 °F). Butter and flour the bundt cake form with all-purpose flour.
Mix all the dry ingredients. Mix the eggs, yoghurt and melted butter. Add the dry ingredients into the dough through a sieve. Fold in the Mars chocolate bar pieces.
Pour the dough into the cake form. Bake on the lowest level of the oven for about 1 hour until only a couple of crumbs stick to a test stick. Don’t bake too long.
Decorate the cake with some icing sugar.