Cookie-

Planar uv the obj. generate uv template. find cookie jpg. create texture. desaturate, tweak, create displacement. set up in mat room with math subtract node and image map node into displacement.

Sugar crystals- cube primitive, scale, duplicate, arrange, duplicate, arrange, export as wavefront object. import. some kind of glass or crystal shader tweaked to taste in mat room on crystals.

save mat.

export all as wavefront object.

reimport.

save as .pp2

sugar cookie.

or some variation on the above. I would do it all in an external modeling program, though.