The floury troll is guarding the oven.
She doesn't want any funny business with it.
She needs to be distracted.
Ask Mr.Fumble to talk to her. Then you can use the oven.
Oh yeah, she has that, too. You should fool the alarm somehow.
It works with a laser that detects if it is cut.
A mirror, or similar?
You have a highly reflective sticker with you.
Get forward with other stuff. You could, for example, swap stickers.
It is highly reflective...
Use the Skeletortilla sticker on the alarm. You can now fiddle with the oven when Mr. Fumble is talking to the troll.
Disabled oven alarm
Something that burns with great intensity. ?
Get one of those action figures. Put the action figure into the oven.