Put the butter, sugar, cinnamon and salt in the bowl, whisk (without butterfly): 2 min. speed 4.
Add the flour and starch, stir in: 30 sec. speed. 3.
Wrap the dough in plastic wrap and keep it in the freezer for 1 hour.
At this point, form 3 rolls about 30 cm long, cover them with plastic wrap and place them back in the freezer for another 2 hours.
Then roll them in brown sugar, cut slices about 1 cm thick and place them on a baking sheet with baking paper.
Bake in a preheated oven at 170°C for about 15 minutes.
Allow to cool completely before serving... Buon appetito!
I divided the mixture in half, in one I put cinnamon, and in the other half dried lavender.
They are kept for a few days in a tin box.
*For those who are intolerant to dairy products, lactose-free butter can be used.