BEAT first 5 ingredients in large bowl with mixer until well blended. Add flour and baking soda; mix well. Stir in nuts. Refrigerate 30 min.
HEAT oven to 350°F. Roll dough into 60 (1-inch) balls; shape each into crescent shape. Place, 2 inches apart, on baking sheets. Flatten slightly.
BAKE 10 to 12 min. or until lightly browned. Cool 3 min. on baking sheets; transfer to wire racks. Sprinkle with powdered sugar; cool completely.