1) Knives! Okay, not really. But we do have a wavy pressure blade we got from a Montessori catalog. It cuts with pressure against the cutting board, with both hands on the handle. He's used it on bananas, sausage, carrots, onions, and other fruits and veggies. I always make sure to work nearby in case there are issues, of course.
2) Stirring and mixing! This is an easy one, but we do try to make sure he doesn't touch raw meat or eggs. It's helpful to use a much larger bowl than you think you'll need.
3) Herbs and spices! Little Miss really likes this one. It's super-easy for them to dump a pre-measured pinch bowl full of something into the recipe.
4) Pushing buttons! We let him press the buttons on most everything, with supervision. Hovering, neurotic supervision. I keep one hand on the device even if it has an auto shut off.
5) Moving prepped food to it's serving vessel! Even if he can't help cook a dish, he's usually eager to help get it on the table.
6) Setting the table! Other than our wedding china and the steak knives he's good. He also lets his sister hand out the napkins, which is way too cute.
7) Serving himself! Before we had kids my husband always plated each meal but now we put everything in a serving dish and let the kids choose their own portions. Well, the toddler makes a valiant effort.