My Dad has told me about this dish for as long as I can remember. He swears it is sublime, and I believe that.
Where can it be had, and what is the deal with it?
You can find mizithra cheese with a little effort. If you want a restaurant, the Old Spaghetti Factory is a regional chain that serves it, as does the occasional small stand place.
It’s GOOD. It just is.
The only restaurant I’ve seen it on a menu in the Old Spaghetti Factory. I thought they invented it.
I’m guessing this is the “Old Spaghetti Factory” I remember from my youth in California. I could put down eight loaves of their sourdough bread with the garlic butter they served. I crave that almost as much as the fries when Carl’s Jr. used to fry them in beef tallow.
In Ohio we have a “Spaghetti Warehouse” which is good, and almost comparable, but obviously not the same.
I can’t wait to try this dish, but I’m a bit apprehensive of the inevitable and instant heart issue it will give me.
Perhaps it’s a good deathbed meal…
Ah Mizithra cheese! It is a Greek favorite of mine. Finding it may be difficult, but there’s always the Interwebs; which is where I would start. If you have a Greek or other Euro-style deli, look there. Worth the effort, believe me. 
Yeah, the Old Spaghetti Factory (it’s a national chain*, not just California) is the only place I’ve ever seen it on a menu. It is my preferred dish there (though I’ll usually get it without the butter) but I don’t know if that is because it is really good or for the most part the food there is barely adequate.
For a long time, since that was the only place I’d ever even seen mizithra cheese I kind of assumed they’d just made up the name for marketing purposes.
*On a business trip to Minneapolis about 15 years ago I was taking the bus downtown from the airport. While waiting for it a woman asked where I was visiting from and so on. Eventually she says there is this restaurant I just have to try. Of course it turns out to be The Old Spaghetti Factory.
Politeness required that I not tell her that over the years I’d eaten at a half dozen different ones on the west coast, nor that their food isn’t really that good.
There is some legend on the menu that Homer ate this every day. I sincerely doubt this, but it is what I order when I go to the Spaghetti Factory. Which I haven’t done in years, even though there is one in Gastown. Maybe I will have to take my parents there. They like chain restaurants, local independent places make my dad suspicious.
It’s on the menu of at least 1/2 the Greek restaurants in Chicago as far as I can tell.
It’s not particularly difficult to make, either. Browning the butter takes some practice and a good sense of when to remove the heat. But that’s literally all that’s in it - butter, mizithra cheese, and noodles.