Make brownie mix according to package directions. Preheat oven to 350 degrees and grease 2 12-cup mini-muffin tins.
Fill each muffin tin about 2/3 full with brownie batter. Bake 10 minutes. Let cool slightly and remove from muffin tin. Use your thumb or back of a spoon to press an indentation in each one.
Beat heavy cream until stiff peaks. Refrigerate until needed.
Beat cream cheese, peanut butter, and powdered sugar until smooth. Fold in whipped cream.
Transfer peanut butter mixture to a large plastic bag and snip corner with scissors.
Fill each brownie cup with peanut butter mixture.
Top with mini chocolate chips. Store in refrigerator.