For the dough, stir the butter until smooth. Gradually stir in the sugar, vanilla sugar, eggs, salt and baking oil. Sift the flour with the baking powder, stir in a tablespoon at a time. Pour the dough into greased molds.
For the topping, drain the peaches, cut them into slices and place them on the dough.
Put the flour in a bowl, mix with the sugar and van sugar. Add the butter in flakes and mix everything with your hands or 2 forks to form sprinkles. Put the crumble on the peaches.
Put the muffins in the oven preheated to 175 degrees and bake for 15-20 minutes.
For the icing, sieve the powdered sugar and stir it into the lemon juice until it becomes thick and thick. Pour this topping over the muffins immediately after baking, using a brush or teaspoon.