01 -
Preheat your oven to 320°F (160°C) with fan/convection on. Line a 12-cup muffin tin with paper liners, or grease and flour the cups if you don't have liners.
02 -
In a large bowl, beat the softened butter with salt, sugar, and vanilla sugar until light and fluffy, about 3-4 minutes. Add the eggs one at a time, mixing well after each addition until fully incorporated.
03 -
Sift the flour and baking powder together. Add to the butter mixture alternating with milk, beginning and ending with the dry ingredients. Mix just until you have a smooth batter. Gently fold in the blueberries, being careful not to crush them.
04 -
Spoon the batter into the prepared muffin cups, filling each about 3/4 full. Place in the middle rack of your preheated oven and bake for approximately 20 minutes, until the tops are golden and a toothpick inserted in the center comes out clean or with just a few moist crumbs.