Working with one portion at a time, gently flatten or roll the dough into a rectangle approximately 4 inches wide and 6 inches long.
Starting approximately 1 inch from the bottom edge, spread a thin line of the cinnamon-sugar mixture across the width of the dough. Fold the bottom edge of the dough up and over the cinnamon-sugar line, then press firmly along the dough to seal it.
Spread another thin line of the cinnamon-sugar mixture directly above the sealed edge. Roll the dough over the filling again and press firmly to seal.
Repeat this process 2–3 more times, adding a thin line of cinnamon sugar before each roll. Continue rolling and sealing until the dough is completely rolled into a tight log.
Firmly pinch the final seam closed to prevent the cinnamon filling from escaping during boiling and baking.
Gently roll and stretch the log into a rope approximately 8–9 inches long. Bring the ends together to form a ring, overlapping the ends by approximately 1 inch. Firmly pinch and roll the ends together to create a secure seal.
Place the shaped bagel on the prepared baking sheet. Repeat with the remaining dough and cinnamon-sugar mixture.