Put all the ingredients in the jug except the chocolate chips, mix: 1 min. speed 4.
Add the drops, mix: 30 sec. Reverse at speed 4.
Coat a muffin plate with paper cups and fill them for 2/3.
Bake in preheated oven at 180° C for about 15-20 minutes (do the toothpick test).
Allow to cool, sprinkle with powdered sugar and serve... Buon appetito!
I used this baking powder.