The Chocolate Layers is a name under which Jarvis Cocker and Steve Mackey remixed a few songs between 1998 and 2001. Probably their most well-known remix is of The Facts of Life by Black Box Recorder
The name seems to have started off as a joke associated with Pulp's experimental B-side That Boy's Evil. As well as appearing on the A Little Soul single, the track was also issued in small numbers as a promo one-track white-label single. This promo contained no mention of Pulp and was credited to The Chocolate Layers, which the accompanying press release claimed were soon-to-be-famous "hot new West Coast underground funkateers".
That Boy's Evil includes a garbled recording of some American teenagers talking, which includes the phrase 'chocolate layers'. This is quite possibly where the name originated.
Jarvis and Steve have not used the name since 2001, although they have worked together on a number of projects since.