Cookie Time is a Jimmy Neutron: Boy Genius short.
Jimmy tries to get cookies, but to have brussels sprouts for dinner, his mother tells him just one cookie. Jimmy uses his latest invention, the Quantum Replay to repeat in four times. Goddard then tries to eat the remote, causing him and Jimmy to end up time traveling in prehistory. Jimmy then asks a tyrannosaurus rex if it wants a cookie. But then, it chases after him and Goddard.
This is a video of the short.