Cream butter and sugar with the whisk of the mixer. Quickly knead in the flour. Cover and chill for approx. 30 minutes.
Roll out the dough 3-4 mm thinly on a work surface sprinkled with flour. Cut out approx. 35 Eiffel Towers from the dough (cookie cutters e.g. from Birkmann, approx. 10 cm in size). Knead and roll out the remaining dough again and again. Place the biscuits on two baking trays lined with baking paper and bake them one after the other in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for 8-10 minutes until golden brown. Let them cool down.
Divide the chocolate into pieces and melt in a hot water bath with coconut oil. Pour into a small piping bag and spray a grid on the biscuits. Let the biscuits dry.