Preheat the oven to 350°F. Sift the flour, baking soda, and salt into a bowl.
In a separate large bowl, use an electric mixer to cream together butter, granulated sugar, and brown sugar. Mix in maple syrup, egg, and vanilla until well blended.
Gradually mix in the flour mixture until well blended.
Shape dough into 1-inch balls. Place on greased or parchment-lined cookie sheets 2 inches apart. Flatten slightly with the bottom of a glass.
Sprinkle each cookie with granulated sugar. Bake until golden, about 8-10 minutes. Transfer to wire racks to cool.