Preheat oven to 350°F (180°C) and line a baking sheet with parchment paper. TIP: Lightly grease the parchment paper to prevent the cookies from sticking.
In a large bowl, whisk together the flour, rolled oats, baking powder, and ground cinnamon. TIP: You can lightly pulse the oats in a food processor for a finer texture.
In another bowl, cream together the butter, sugar, and vanilla sugar until light and fluffy. Then, add the egg and mix well.
Stir in the grated apple into the butter mixture, then gradually add the dry ingredients until a homogeneous dough forms. TIP: If the dough is too soft, add a little more flour.
Shape the dough into small balls and place them on the prepared baking sheet. Gently flatten them to form cookie shapes. TIP: Work with wet hands to prevent the dough from sticking.
Bake the cookies for 12-15 minutes, or until the edges are golden brown. TIP: Do not overbake to keep the cookies soft inside.
Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.
Dust with powdered sugar and serve. TIP: Store the cookies in an airtight container to keep them fresh.
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