Cut the butter into small cubes. Put butter, powdered sugar, nuts and flour in a food processor.

Blend in the food processor until clumps start to form (about 1 minute). Be careful not to over mix or the dough will become sticky.

Line a cookie sheet with parchment paper. Form the dough into about 20 cookies about 2.5 cm (1 inch) round. Arrange them on the baking sheet.

Bake in your preheated oven for 18-20 minutes. When they are just beginning to brown a little, they are finished.

Let the cookies cool before dusting with powdered sugar. You can dust with a fine sieve or place the cookies along some sugar in a plastic baggie and shake. Plain is fine too!