Let the butter soften at room temperature then mix it in a bowl with the sugar.
Add the egg and possibly the vanilla sugar.
Gradually add the flour, baking powder, salt and chocolate chips. Mix well.
Place baking paper on a baking sheet. On this baking paper, form with the help of two spoons or your hands of the pasta nuts. Space them well as they will spread during cooking.
Bake for 8 to 10 minutes at 180°. Take them out as soon as the outline starts to brown.
After removing cookies from oven, allow to cool until warm but still soft. Place the mini eggs onto the cookies and push softly to hold them in place.