My DGS is 2 and a half and we love cooking together too. He was badly allergic to eggs and dairy which limited things a bit until he grew out of it fairly recently. Cinnamon cookies were first. The mix, mix, mix stage scattered flour far and wide, then rolling the dough into small balls in his hands. They spread in the oven so the shape didn't matter. Pizza with home made dough is brilliant (I know you can buy ready made dough too), and sausage rolls are always quick and easy if we buy ready made puff pastry to roll out ourselves. He loves those as a very quick and easy to make lunch or supper with fresh tomato sauce, grated carrot etc. But for a real treat, the gingerbread house we made before Christmas was the winner. COVERED in icing, then v e r y c a r e f u l l y placed jelly tots.