Preheat oven at 170°C/ 335F .

In a large bowl mix the butter with the sugar until sugar dissolve, add vanilla or almond flavour, give it a quick mix.

Add flour, and mix all together until smooth and buttery cookie dough.

Take about a tablespoon of the dough(10g), shape as soft small balls.

Place cookies in a baking sheet covered with parchment paper, top each cookie ball with pistachio, tap lightly to flatten the cookie.

Bake on preheated oven for 7-10 minutes.

Cool completly before serve .