I don't think Paul knows what a snickerdoodle should taste like
Ok yes, it's been a week, and it's still bothering me.
An American snickerdoodle cookie is pale, cinnamon sugar flavored on the outside, and leavened with baking soda, aka bicarb, enough so that you do taste that alkaline tang. That's the whole point of the cookie, Paul. From the description of the bake, it was the correct cookie.
I will say the peanut brittle sounds like a mistake though. Shouldn't gild a lily. A properly made snickerdoodle is perfect as-is.