Etymology From the brand name Shake 'n Bake, a powdered seasoning, so called because one could put it in a plastic bag with meat, then easily season the meat by shaking.
1
Informal Something fast, or easy to use or perform; a simple, crude object or action.
Yet, until the last few decades of the twentieth century, the approach that Levi describes, which chemists like to call ‘shake and bake’, was often the best they could do.2001, Philip Ball, Molecules: A Very Short Introduction, Oxford, published 2003, page 24:
Etymology From the brand name Shake 'n Bake, a powdered seasoning, so called because one could put it in a plastic bag with meat, then easily season the meat by shaking.
1
Informal Crude, unsophisticated; not professionally done, improvised.