My DD loves cooking too and for her fourth birthday we gave her an apron, chefs hat and a pink mixing bowl with her own wooden spoon, spatula, whisk. She absolutely loves them!

She also got one of those masterchef kids cooking packs from her grandparents (the pizza one) which comes with pizza tray and cutter and recipes. They are a bit exxy though I think for what they are and you could make up your own for cheaper.