Preheat oven to 325 degrees
Combine all ingredients except powdered sugar in food processor. Using on/off turns, process until mixture resembles coarse meal; then process continuously until dough begins to come together.
Roll 2 teaspoonsfuls of dough between palms of hands to form a 2 & 1/2 inch long rope, tapering at ends. Place on ungreased baking sheet; curl in ends to form crescent shape. Repeat with remaining dough, spacing cookies 1 inch apart.
Bake cookies until just firm to touch, about 20 minutes. Cool on sheet 5 minutes. Transfer to rack; cool. Sift powdered sugar over cookies.
Store in airtight container at room temperature; can be made 3 days ahead.
Makes about 30 cookiesRecipe submitted by Miji on 9/23/00