cook up

verb

cooked up; cooking up; cooks up

1

: to prepare (food) for eating especially quickly

I can cook up some hamburgers.

He cooked this whole meal up in less than 30 minutes.

2

: to invent (something, such as an idea, excuse, etc.) to deal with a particular situation

They cooked up a scheme to fool their neighbor.

You'll have to cook an excuse up quickly.