Preheat oven to 350°F. Add the flour, confectioners' sugar, and salt to a small bowl and whisk together.
Melt the butter in a small saucepan (or in the microwave), add the vanilla extract to the butter and stir, then pour into the dry ingredients and stir together until thoroughly moistened.
Press the dough evenly along the bottom and sides into a 9-inch tart pan with a removable bottom.
Place the tart pan on a baking sheet and bake until the crust is golden brown, about 20 minutes.
