We did this once per week over a few weeks. Great fun, you do need to have some baking experience, and equipment. It was pretty crazy with 25 in groups of 3-4 in a normal classroom but the kids loved it so it was worth the effort. We used to kick off science fair so we emphasised the repeatability, variables, testing, following the scientific method, evaluating etc. Def recommend, advise you to resources yourself with a whizz stick to blend the apple, beetroot etc. Big thanks to School Kit for the resources and taking us out of our comfort zone. The supporting paper work and Evaluation Forms were great as well. You can really extend this, and a bit of research first into things such as egg alternatives is useful to extend curiosity.