By 12 I was definitely making brownies, cookies, and fudge by myself. Gee, when I was 11 I went by myself to the downtown electronics store for parts. Took the subway, but soon walked tge distance, my love of walking derives from those early solo walks.
I though this was going to be a chemustry set with chemicals, except the end product was edible, unlike chemistry sets of fifty years ago when you coukd burn sulphur and other fun things. Even my mictoscope kit came with brine shrimp eggs (ie Sea Monkeys).