2 cups powdered sugar
2 tsp vanilla extract
2 cups all-purpose flour
1 cup pecans, toasted, coarsely ground
1/8 tsp cinnamon
Beat butter in large bowl until light and fluffy. Add 1/2 cup powdered sugar and vanilla. Beat until well blended. Beat in flour, then pecans. Divide dough in half, form each half into a ball. Wrap in plastic and chill until cold, about 30 minutes.
Preheat oven to 350 degrees. Whisk remaining 1-1/2 cups sugar and cinnamon together. Set aside.
Roll 2 tsp dough into ball. Place 1/2 inch apart on baking pan. Bake until golden brown on bottom and pale golden on top, about 18 minutes. Cool 5 minutes, then toss in cinnamon sugar to cover (will melt into cookie). Let cool completely on rack. May be made 2 days in advance.
Before serving, sift remaining cinnamon sugar on top.