In a large bowl make brownie mix according to the directions on the box . Stir in 2/3 cup chocolate chips.
Pour brownie batter over cereal mixture. Sprinkle with remaining 2/3 cup chocolate chips.
Bake 20 minutes.
Remove from oven.
Mix sugar and cinnamon together and sprinkle it evenly over the top of the bownies.
Bake 14-18 more minutes longer or until brownies are set when lightly touched in center.
Cool 10 minutes; loosen the edges but do not cut. Cool completely, about 2 hours.