Preheat oven to 350°F.

Mix together the cake mix, peanut butter, canola oil and the egg.

Press the mixture into the bottom of a 9×13 inch foil lined, greased pan.

Top the crust with peanut butter chips, chocolate chips and peanut butter cup minis.

Pour sweetened condensed milk over everything.

Bake at 350°F for about 25 minutes.

Allow the bars to cool completely before removing the foil and cutting them.