Place ingredients in the bread machine in the order listed. After completion of the dough cycle, shape dough into 12 balls and place 2" apart on greased cookie sheets. Cover and let rise until double — about 45 to 60 minutes.
Meanwhile, prepare Flavored Topping Mix.
Beat sugar and butter until light and fluffy. Stir in flour until mixture is the consistency of thick paste. Stir in cinnamon and vanilla extract. Divide mix into 12 equal pieces. Pat each piece into a 3-inch circle.
Place 1 circle of topping mix on each ball of dough, gently shaping it down over the ball. Make 5 or 6 cuts across the topping, using a table knife, to form a shell pattern.
Heat oven to 375 degrees F (190 celsius). Bake buns until golden brown, about 15 to 20 minutes.