In a small saucepan over medium heat, melt butter and whisk in the brown sugar and peanut butter. Heat until sugar dissolves (about one minute). Remove from heat immediately and allow to cool to room temperature (very important)

In a large mixing bowl, beat cream cheese with powdered sugar until creamy (about 3-4 minutes, don't skimp on the beating time). On low, add in brown sugar mixture (that has cooled to room temperature). Mix until combined.

Fold in mini chocolate chips and mini Reese's cups. Serve immediately or store in refrigerator until ready to serve. Enjoy with pretzels, animal cracker and graham sticks.