My 2 yr old loves baking fairy cakes - ie stirring and dropping mixture into the tray - but if I'm trying to get tea ready I give her some biscuits or oatcakes, some cake decorations (whatever on offer) and I have two tubes of ready to squeeze icing in the cupboard. She tends to leave them but they're rather pretty and cheery in my lunchbox at work 
She also loves peeling the back off stickers and gluing - so I give her some paper, some glue on a plate and some bits of paper to make a picture.
We too seem to do the same thing so it's great to swop tips. X