In a small saucepan over medium heat, melt butter and whisk in the brown sugar and peanut butter. Heat until sugar dissolves, then remove from heat and let cool.

In a large mixing bowl, beat cream cheese with powdered sugar until creamy, then add cooled brown sugar mixture and mix well.

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