Dang, that sounds incredible! I'd make a brown butter cookie flavored ice cream with chocolate covered crunchy cookie bits.
Gotta share this ice cream I recently grabbed called Jeni's. They don't have exactly what you described but the 'skillet cinnamon roll' is soo close. It definitely got me hooked, the flavors I've tried so far are wildly accurate.
I'd make one called "Super Vanilla"
It's like regular vanilla ice cream but the person serving it to you calls you boring and try to interest you in one of their own kinks.
Oh man I had a friend who introduced me to adding a splash of cognac on top of chocolate ice cream... it was awesome and I'd totally forgotten about it until now!
It would taste like the feeling of smug satisfaction you get when you're proven right and you get to say "I told you so!". Kind of like the medicine Mary Poppins gives, it would taste different for every person.