In a bowl, combine the flour, baking powder, vanilla sugar, and a pinch of salt.
In another bowl, whisk the eggs with the sugar, then stir in the melted butter and milk.
Gradually add the dry ingredients to the wet mixture, mixing until the batter is smooth.
Gently fold in the blueberries, being careful not to crush them.
Preheat your grill to medium heat (approximately 350°F/180°C) and prepare a heat-resistant muffin tin or BBQ baking sheet.
Fill the muffin cups with the batter, about ¾ full, to allow room for rising.
Place the muffin tin on the grill and bake covered for 20-25 minutes, or until the muffins are golden brown and have risen.
Check with a toothpick: if it comes out clean, they are done.
Let cool for 10 minutes, then serve sprinkled with powdered sugar or garnished with fresh blueberries.
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