Assortment of Filled Cookies: The Recipe with a Single Dough

Mix the butter and egg in a bowl.
Add the oil, caster sugar and vanilla sugar.
Then stir in the cornstarch, baking powder, salt, and flour.
Form a smooth, homogeneous dough, then cut it into portions of 18 to 20 g each.
Shape the biscuits and bake at 180° for 12 minutes.
Fill and decorate to your heart’s content.