Put the butter, sugar and vanilla in the bowl, whisk (without butterfly): 1 min. speed 4.
Remove the mixture from the walls of the bowl, set to speed 3 and add one egg at a time, continue for 1 min.
Add the flour, starch, cocoa and baking powder, mix: 30 sec. speed. 3.
Add the broken chocolate and incorporate them well with the help of the spatula.
Form balls with the help of a spoon and place them on a baking sheet lined with parchment paper, spacing them apart.
Bake in a preheated oven at 190°C for 10-12 minutes.
Allow to cool completely and serve... Buon appetito!
* check that the word “gluten-free” appears on the packages.