Someone's in the Kitchen With Katherine

Someone's in the Kitchen With Katherine is the 54th episode of Season 31 on Disney and the 68th on Nickelodeon. Katherine is taking on cooking but she thinks her kitchen is haunted, so Phineas and Ferb are on the case. Doofenshmirtz creates a machine to get rid of areas in total darkness.

Episode Summary
Katherine is waving goodbye to Heidi after hanging out with her. After Heidi is gone, Katherine remembers how Heidi had a cook off and how Phineas and Ferb made new food. It made Katherine want to take an interest into cooking herself.