Some useful sites for cooking with kids:

https://www.bbcgoodfood.com/feature/how-get-kids-cooking

https://www.bbcgoodfood.com/recipes/collection/kids-cooking

https://www.cookingwithmykids.co.uk/

https://www.bbc.co.uk/cbeebies/grownups/cooking-and-baking-with-toddlers

https://www.sitters.co.uk/blog/15-fun-cooking-activities-for-kids.aspx

https://www.greatbritishchefs.com/collections/kids-recipes

http://www.greatgrubclub.com/domains/greatgrubclub.com/local/media/downloads/Cooking_is_fun_toolkit_FINAL_1.pdf