Preheat the oven to 350°F.

Add the butter, 2/3 cup sugar, and maple extract to a medium mixing bowl. Using a hand mixer, beat on medium speed for 1 minute, until combined.

Add the flour and continue beating for an additional 2 minutes, until combined. The dough will be crumbly.

Shape the dough into 1-inch balls. Roll each ball in the remaining 1/4 cup sugar and place at least 2 inches apart on a cookie sheet.

Bake for 15 minutes, or until the edges are lightly browned. Let stand on the cookie sheet to set for 2 minutes then remove to a cooling rack. Cool completely and serve.