Do not let your 2 year old turn the mixer on when making cookies. We were making sugar cookies on Sunday afternoon and the girls were "helping". Sydney wanted to turn the mixer on. Instead, she turned the button to pulse, and when adding flour, it's not a great idea. At the moment it seemed like it was happening in slow motion but in a split second there was flour covering almost every square inch of my kitchen.
*Aubrey, this is karma from our Halloween cookies a few years ago.