Mix Krusteaz Peanut Butter Cookie mix with butter and egg until combined.
Add 1 Table spoon cookie batter to bottom of muffin tins.
Bake at 350 degrees for 10 minutes.
While baking-- mix cream cheese and sweetened condensed milk with a hand mixer and refrigerate.
Melt chocolate chips in microwave. 30 seconds on 50% heat and repeating until melted.
Let cookies cool for 10 minutes. Use spoon to push down center of cookie.
Add Cream cheese mixture to ziplock bag or frosting bag and fill cookie.
Swirl melted chocolate over cream cheese mixture.
Refrigerate for 20 minutes.