George Stella’s cauliflower and cheese is the bomb – you can easily Google it. Tastes better than macaroni and cheese and my non-keto friends devour it. I agree w your guy on the shiratake noodles except for some Asian dishes like Pad Thai.
I also make easy Alfredo sauce that non-ketoers love with sauteed cabbage (believe it or not), or on spiralized zucchini.
I have tried mightily to find a good pasta sub and the above are the best.
Also you can use the fathead dough to make very decent bagels.
Finally who doesn’t love cheese crisps for quickie taco shells or tostadas? I buy the pre-sliced provolone that’s round and nuke it for one minute on parchment paper. Awesome!
Oh also, there’s a recipe out there called Soul Bread that makes a decent sandwich loaf.