Step 3: Cream butter and powdered sugar together until fluffy. Add dry ingredients and chopped walnuts, and mix well with a spatula until dough is combined.
Step 4: Wrap the dough with a plastic wrap and keep it in a refrigerator for about one hour.
Step 5: Preheat the oven to 325 °F.
Step 6: Remove the dough from the refrigerator and divide into 30 or so pieces. Shape each piece into a small ball and place 1 inch apart onto ungreased baking sheets.
Step 7: Bake cookies for 15-17 minutes or until lightly browned. Let cookies sit for 5 minutes before transferring to a cooling rack.
Step 8: Place powdered sugar into a shallow bowl and roll cooled cookies in sugar to coat. Store in an airtight container. If necessary, re-roll cookies in powdered sugar before serving.