1 Make the cookie dough: Mix all the dry ingredients (flour, walnuts, salt, sugar) in a large bowl. Add the vanilla extract. Add the butter in little pieces, and combine everything together with your (clean!) hands until the mixture looks like a coarse meal with nut bits in it.

2 Chill the dough: Chill the dough for at least 30 minutes in the fridge or up to overnight.

3 Preheat the oven to 300°F. Line a baking sheet with parchment or silicon baking mats.

4 Form the dough into balls: Form the dough into small balls no larger than a walnut and place on the cookie sheet, spaced at least an inch apart from each other.

3 Bake for 35 minutes.

4 Roll in powdered sugar: When they are still warm, but cool enough to touch, roll the cookies in some powdered sugar. Set aside on a rack to cool completely. When cool, dust again in powdered sugar.