Line an 8x8 pan with parchment, spritz lightly with cooking spray & set aside
In a large glass bowl, combine sweetened condensed milk & chocolate chips & microwave on 50% power in 30 second increments until melted - stirring in-between each interval.
Once fully melted, transfer to prepared dish & smooth out flat
Place in freezer to set at least 3-4 hours
Remove & cut into small squares
Roll each square between hands to form a ball & place on a parchment lined baking sheet
Once all are rolled - return to freezer for another hour
In a small bowl melt peanut butter chips in microwave in the same manner you did the fudge ingredients
Once melted, dip each fudge ball until mostly coated
Place back on parchment lined baking sheet & freeze about 20 minutes to set