In an electric mixer, beat butter, sugar, salt and vanilla extract together until well blended. Add flour ½ cup at a time until thoroughly incorporated. On floured surface, make a ball out of dough and roll it out into a log shape about 2 inches in diameter. Wrap in wax paper and chill for 1 hour. Once chilled, slice into ¼-inch thick coins. Place coins on parchment-lined baking sheet and sprinkle each with maple sugar and Chardonnay sea salt. Bake in 350-degree oven for 10 to 12 min. or until golden brown. Let cool completely before serving.
Great with tea or coffee.