Preheat oven to 350 degrees F. Cover a baking tray with a Silpat or parchment paper.
Sift flour and baking powder. In a bowl with the mixer on low speed or by hand mix the butter with the sugar and the pinch of salt until it is all integrated. About 3 minutes with the mixer.
Add one egg and one egg yolk, continue beating at low speed until thoroughly incorporated. Add the sifted flour and baking powder and combine at low speed or working with a fork, you will get a soft dough. Form 30 balls 1" in diameter.
Roll the balls of dough into the remaining egg white, and then toss with the chopped walnuts, place on the prepared tray and bake for 15-18 minutes until they are brown on the bottom. Let cool on a rack and serve cold. Store in an airtight container for a one week.
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