Pre-heat the oven to 190°C (375°F) and prepare muffin tins.
Melt the butter and allow to cool slightly. Beat the egg in a bowl and add the milk, yoghurt and cooled butter and mix well to combine.
In a separate bowl mix the flour, baking powder, baking soda, vanilla sugar and sugar. Gently add the dry ingredients to the wet and stir until just combined.
Pour the batter into the prepared tin or cases and gently push several strawberry pieces into each muffin.
Bake for around 18-22 minutes until an inserted skewer comes out clean. Leave on a wire rack to cool and then sprinkle with icing sugar. Enjoy!