Cream: Beat the butter and ¾ cup powdered sugar until light and fluffy.
Add flavor: Mix in the vanilla and ground walnuts.
Add flour: Mix in the flour on low until a soft dough forms.
Chill: Wrap the dough and refrigerate for 1 to 2 hours.
Preheat: Heat the oven to 350°F and line baking sheets with parchment.
Shape: Roll tablespoon-sized pieces into 2½-inch logs and bend into crescents. Place 1 inch apart.
Bake: Bake 13 to 15 minutes, until set and just lightly golden on the bottom.
First coat: Cool 5 minutes, then gently roll the warm cookies in powdered sugar.
Second coat: Once completely cool, roll or dust with powdered sugar again.