Preheat oven to 375℉. Prepare a cookie sheet by lining with parchment or non-stick cooking spray.
Combine all ingredients except sanding sugar in the bowl of a food processor. Pulse until the mixture begins to clump together and form a dough.
1 cup all-purpose flour, ½ cup confectioners' sugar, 8 tablespoons cold butter, 1 teaspoon fresh lemon zest, ½ teaspoon fresh lemon juice, ¼ teaspoon vanilla bean paste, 2 tablespoons fresh basil leaves, ¼ teaspoons sea salt
Pour out into a bowl and make sure everything is well incorporated. Using a 1 tablespoon measure, scoop out dough and roll into a ball. If the dough is too sticky, chill the dough for about 20 minutes or dust your hands with powdered sugar before rolling.
Place dough balls a few inches apart on the prepared cookie sheet. Dip the bottom of a drinking glass in powdered sugar before pressing down lightly to "smash" the cookies into a disk.
Sprinkle with sanding sugar if desired, and bake for about 10-12 minutes or until the edges just begin to turn golden. Remove from oven and allow to cool for a few minutes before moving; they'll be crumbly and hard to move when they're warm.