One of our favorite things to make these days is the yogurt cake from Bringing Up Bebe, a fun little parenting memoir which I thoroughly enjoyed. The recipe is in the book if you're interested, but the key point is that it is measured using single-serving yogurt cups. It's a great introduction to measuring because little ones don't have to remember which lines mean what - the just scoop and pour and stir. (I did the few actual measurements and then stood back and let him do the rest.)
(Yes, you CAN have white and brown chocolate chips!)
(I poured from our awesome batter bowl into the springform - the best pan for the job, imo)
If you're wanting a recipe to refer to now, this one from Orangette is swoon-worthy. Trust me.
Always document your accomplishments:
Now go bake something yummy this weekend!