Preheat Oven: Preheat the oven to 180°C (350°F) and line a baking sheet with parchment paper.

Cream Butter and Sugar: In a bowl, cream together the margarine or butter and powdered sugar until smooth.

Add Wet Ingredients: Add the egg and sunflower oil to the mixture, and mix well.

Incorporate Dry Ingredients: Stir in the wheat starch, vanilla sugar, and baking powder.

Gradually add the flour, mixing until a dough forms.

Add Chocolate: Break the chocolate into small pieces and fold them into the dough.

Shape Cookies: Roll the dough into small balls and place them on the prepared baking sheet.

Flatten each ball slightly with the palm of your hand.

Bake: Bake for 10-12 minutes, or until the cookies are lightly golden.

Remove from the oven and let cool on a wire rack.