Equip the muffin tin with paper liners. Preheat the oven to 180 degrees (convection 160 degrees).
Mix flour with baking powder. Whisk the egg in a mixing bowl. Then mix in sugar, vanilla sugar, oil and yoghurt and mix everything together well. Gradually mix in the flour. Then mix in the raspberries (with TK they should still be frozen). Pour the batter into the muffin wells and bake in the middle for 20-25 minutes.