My daughter made lunch for us today, which was an exciting endeavor since she's 3. She made mini-pizzas on english muffins. She split the muffins, scooped the sauce...the works. I was relegated to "prep chef," grating cheese and wiping up crumbs.
Some say that getting your kids involved in cooking makes them more likely to eat the resulting meal. In my experience, there is so much ingredient-sampling that takes place during preparation that no one is hungry enough to eat the finished product. The exception to that might be when cookies are the end result. All good fun.