cook up
• devise a clever or devious story, excuse, or plan.
• "I've had plenty of time to cook up an outlandish conspiracy theory"
Similar:
concoct,
devise,
put together,
create,
contrive,
fabricate,
prepare,
trump up,
hatch,
brew,
plot,
plan,
scheme,
invent,
make up,
think up,
dream up,
