COMBINE CHOCOLATE MILK AND CINNAMON IN A SAUCE PAN. STIR OVER LOW HEAT UNTIL SMOOTH AND SHINY; RESERVE ABOUT half CUP FOR LATER. IN A ALRGE BOWL COMBINE WAFERS CRUMBS, MARSHMALLOW AND SUGAR. STIR IN CHOCOLATE MIXTURE. BLEND WELL. PRESS INTO A LIGHTLY BUTTERED 20 cm PAN. SPREAD REMAINING CHOCOLATE MIXTURE OVER THE TOP. CHILL FOR 1 HOUR BEFORE SERVING.