Preheat oven to 325 degrees F.

Prepare the brownie batter according to package directions. Portion batter into mini whoopie pie tin cups. Bake for 18 to 20 minutes until brownies are set in the center. Remove from oven, let cool for 10 minutes. Remove brownies from tins to a wire rack and cool completely. Repeat with remaining batter.

In a medium bowl, beat together cream cheese and marshmallow fluff. Transfer to a piping bag or ziploc bag. Cut off the tip of the plastic bag (or one corner of the ziploc bag), and pipe some of the cream cheese mixture onto each brownie.

If you are making poppers, sandwich two of the bites together with cream cheese in the middle, pressingly gently to stick the brownies together. Dip the cream cheese edge of the sandwich in the graham cracker crumbs. If making bites, sprinkle graham cracker crumbs over the top of the cream cheese. {see pictures}