Step 1: Line a slice pan with baking paper and set aside.
Step 3: in a microwave safe bowl, place the butter and condensed milk and heat on high for 2 minutes.
Step 5: remove from microwave oven and add the milk chocolate. Stir constantly until chocolate is melted.
Step 7: pour mixture into the slice pan. Refrigerate until set which is approximately 2-4 hours. Slice into bite size pieces.