S.--
ANy good sugar cookie recipe, so the kids then can use cookie cutters. I ordered a bunch of cool ones from an online company a few years ago, to reflect my kids' interests...my daughter plays cello and clarinet and my son piano and trombone, so I got those...as well as the animals they like, musical notes, etc. The sky's the limit...almost!
ALSO, I made brownies all the time with my kids...back of the Bakers' Chocolate box, one-bowl...and by the time my daughter was 4 she was making them 100% (other than pouring into the pan and dealing with the over) herself and now, at 13, she makes the brownies, as well as many other cookies and bar cookies, 100% herself, or with her younger brother's help.
Also, chocolate molds are fun. Michaels has some, there's a great store in Hatboro (K P or something like that) with more, and I've order specific ones online.
Have fun!