Preheat the oven to 350°F (175°C). In a mixing bowl, cream together the softened butter and powdered sugar until light and fluffy.

Add the vanilla extract and mix well. Gradually add the flour and salt, mixing until just combined. Stir in the chopped nuts if using.

Using a cookie scoop, form the dough into 1-inch balls and place them on a baking sheet lined with parchment paper.

Bake for 12-15 minutes, or until the edges are lightly golden. Remove from the oven and let cool for a few minutes.

In a small bowl, combine the granulated sugar and ground cinnamon. Roll each warm cookie in the cinnamon sugar mixture until fully coated.

Allow the cookies to cool completely on a wire rack before serving.