Heat oven to 375 F. Grease bottom and sides of rectangular pan, 13x9x2 inches.
Stir together 2 tablespoons sugar and the cinnamon; reserve.
Stir Bisquick, milk and 2 tablespoons sugar until dough forms. If dough is too sticky, gradually mix in enough Bisquick (up to 1/4 cup) to make dough easy to handle.
Turn dough onto surface well dusted with Bisquick; gently roll in Bisquick to coat. Shape into ball; knead 10 times. Roll into rectangle, 15×9 inches; spread with butter. Sprinkle evenly with sugar mixture.