Blend white layer ingredients in a blender until smooth. Pour into bowl, then repeat process with peanut butter and chocolate layers.
Tilt serving glass at a 45 degree angle and add half of the white layer. Top with 1/2 of the peanut butter layer, then chocolate layer. Repeat process to get the same look as the photo.
Optional: top with whipped cream and chopped Reese's pieces or chocolate chips.
Notes
I added a few chocolate chips when blending my chocolate layer to get an extra level of chocolate flavor. You could also use a little bit of Dutch cocoa to get a richer chocolate flavor and deeper color.