PREHEAT oven to 300° F.
COMBINE flour and cocoa in large bowl. Combine coffee granules and vanilla extract in large mixer bowl. Stir until coffee is dissolved. Add butter, ½ cup sugar and salt; beat until combined. Add flour mixture; mix just until incorporated. Press dough into ungreased 9-inch tart pan with removable bottom or 9-inch-round cake pan.
BAKE for 55 to 60 minutes or until firm. Sprinkle with 2 teaspoons sugar. Cool in pan on wire rack for 5 to 10 minutes; cut into wedges.