Do Ahead: Pie can be made 1 day ahead. Cover loosely and chill (it’s really good cold).
In my opinion, you will have too much crumb mixture for your dish. If I’d have used all of it, my pie would have been way too thick. I omitted about a 1/2 cup and it was still thick.
Although this crust worked out well, I’d try using traditional, unsweetened, ready-made pie dough next time to see how that turns out.
Since Taleggio cheese is quite soft, make sure it is very cold when grating otherwise you will have a hard time. Also, the smell will be quite strong and funky but when mixed with the parm and mayo, it won’t smell as intense and it’s delicious.