The non-sweet foods suggested above work best for me, but when I get an urge for cookies that won't go away (now rare, but I still get it every couple of months), I mix some melted butter, almond flour, truvia, vanilla & salt (proportions based on an almond shortbread recipe but halving the sugar-equivalent) that add up to 5-10g carbs. Usually I just eat the "dough" and call it a meal.

Sometimes an urge is related to the texture desired, not the specific food that pops to mind.
Often an urge for chips is an urge for crunch or salt. I roast a chicken or backs/legs and enjoy the crisp, salted skin.
Mashed cauliflower with butter & salt whizzed until smooth can cure urges for soft, smooth comfort.
A steak satisfies the desire for chewiness that fish or ground meat won't give you.