The butter material cannot be made until the next build, it is using the new SSS that Albert is in the midst of finishing.
The paper is made using the Sheet material, with Scattering in the medium. The Sheet material is the same thing as a Layer (that you can put over a Conductor or Dielectric), but without any substrate.

The plate is just using the Ceramic material, the knife is using the Complex material with Type=Silver, and the table cloth is just a lambert with texture connected to reflectance,