I put some enchilada sauce (carb-cheap! who knew?) in the bottom of an 8x8 baking dish, then a low carb tortilla onto which I'd spread some refried beans, then sprinkled a handful of shredded cheese on it and spooned some sauce over; then another tortilla, layer of crumbled ground beef that had been browned with chopped onion, cheese, and sauce; another tortilla/beans/cheese/sauce; another tortilla/beef/cheese sauce; and a final tortilla with beans, then sauce again, and topped it with a big handful of shredded cheese. Baked it in the oven at 350 for 25 minutes, or until the cheese started to brown on top, then served it with a generous heap of full fat sour cream on top.
This was EXCELLENT! The photo below shows one serving, or 1/8 of the entire recipe. I haven't figured up the carbs yet because I threw away the cans for the beans and the sauce without thinking. Certainly the tortillas (7gN each) and the beans were the carbiest parts, and if I had to try to remember what the cans listed for net carbs, and do the math in my head, I'd say there were close to 100gN in the entire recipe, plus the sour cream...but that's 8 portions, so only 12-13 per portion, plus sour cream. But that could be way wrong :).
Here's a photo, you can see that the servings are plenty big!