Measure out 56 grams of Lily's no sugar added chocolate chips, it is about 120 chocolate chips, into a microwave safe dish. Add the oil and mix to combine. Microwave in 10 second intervals for about 45 seconds, until melted, stirring each 10 second interval.
Place just enough chocolate in the bottom of each mold to completely cover the bottom and the sides a bit. Spread out to evenly cover then place in the freezer for 10 minutes.
Meanwhile, combine the PB2 powder, sugar and milk in a small bowl. Stir to combine and get the lumps out.
Evenly divide the peanut butter into each mold, on top of the chocolate, and spread out across each mold. Place in the freezer for about 20 minutes.
Heat the chocolate up again and spread of evenly over each mold. Using a knife, carefully smooth out the tops of each mold.