Spaghetti squash enchilada bowls are one of my favorites! Very adaptable but I like one or more of mushrooms, spinach, black beans and/or leftover bits of chicken in mine.
I make these for me while my family has just classic old school ground beef tacos (that I don’t care for).
Probably lots of recipes out there but I have used this one:
https://www.skinnytaste.com/spaghetti-squash-enchilada-bowls/