In a large sauce pan, melt butter over medium heat until slightly brown.
Turn heat to low and add all but three cups of mini marshmallows. Stir until melted and smooth.
Grease a large separate mixing bowl and add Honey Bunches of Oats® with Real Strawberries cereal and remaining mini marshmallows.
Slowly mix in butter and melted marshmallow mixture until fully combined.
Place on a 9x12 inch cookie sheet lined with buttered parchment paper and spread the mixture out with damp hands until even.
Allow bars to cool for about an hour before cutting and serving.