I've always been fascinated by silver nonpareils. They're so similar to ball bearings which are so fun to play with, but these are like ball bearings you can EAT! How fun is that?!
The best thing about these cookies to me is the fact that they didn't turn over all the M&Ms to make them plain red. I see this as a sign of smart priorities. Just jam the chocolates on there as fast as you can because the sooner they're done, the sooner we can eat them!
This taps right into that toddler part of the brain where you want to pick up a whole pie and smash your face into it. Taking a big ol' spoon and jamming it into a jar of cake and frosting and having no regard for the mess you're inevitably going to make sounds so childishly satisfying. Where's my big spoon?