Gather all ingredients.

Preheat the oven to 350 degrees F (175 degrees C).

Cream butter and vanilla together in a medium bowl with an electric mixer until smooth.

Whisk flour and 6 tablespoons powdered sugar together in a separate bowl. Add to the butter mixture and stir until just blended. Add walnuts and mix until incorporated; mixture may be crumbly.

Take small scoops of dough and roll between your hands into 1-inch balls. Place balls 2 inches apart on ungreased cookie sheets.

Bake in the preheated oven until edges are just turning golden, about 12 minutes.

Remove from the oven and transfer to a wire rack to cool for 15 minutes.

Place remaining 1/3 cup powdered sugar in a small bowl. Roll cooled cookies in the powdered sugar once or twice.