Baking with 3 yr old

Today I decided to make pumpkin cookies, you know with halloween coming and all, and there's no choice but to include my three year old. He said "we go fast 'cause I help you". He loves using and watching the stand mixer and he actually knows what I mean by "low speed". Measuring is more of a challenge, flour isn't everywhere, but close!
Afterward I let him lick the beater, I know, raw eggs, but I can't help it, it's so tradition.
While they baked he rode his trike in the driveway and ran around the house four or five times. The energy level of a child is amazing.