Tian De Courge (Squash Gratin)

Tian De Courge is easily my very favorite autumn dish. DH's aunt made it one Thanksgiving years ago and I've been making it ever since...well, ever since a couple of years ago. I've missed it, and this year instead of grumbling about it, I reworked it to be safe for my family. Although there is no chance the girls will go near this dish yet, I'm making it egg-free anyway against the time they