1 cup unsalted butter, softened 1 teaspoon vanilla extract 2 cups all-purpose flour 6 tablespoons powdered sugar 1 cup finely chopped walnuts ⅓ cup powdered sugar, or more as needed 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, 2 to 3 minutes. Whisk flour and 6 tablespoons powdered sugar together…