I feel for you, having been through a similar exercise a few times over (except not “food friends” – just friends, as life changes took my closest friends far away every 5-6 years or so, ugh).
I’m not a FB person (especially in the last decade or so) so social groups based there were not of help to me, though it still remains the easiest and most vast social sea into which to cast a net.
Meetup varies significantly in quality somewhere like NYC, but in a smaller place it could be a useful resource – check out what exists food-wise, and if nothing appeals, set up a something of your own and see how it goes (it will probably take a few events, not one and done).
You said you’re halfway between Vancouver and Seattle: if they are close enough to drive for a meal once a month or so, they might be better sources for FB/Meetup groups or cooking lessons or food tours.
Do I recall correctly that you are in a university town? Is a way to draw on that? Are there food-related classes at the university? Are there events that are public, or could you post something you organize where staff / faculty would see it?
Seems you don’t think your existing friend groups would go along with you picking a restaurant to try once a month, or similar food expedition. Or is it that you want a food-focused meal, and the people are less of a factor? Could you access the broader groups your friends come from (kids’ classmates’ parents and so on) – ie people you don’t hang out with normally – for the food focus? For eg if you organized a food expedition that was open to all <eg: middle school> parents, you might end up with a different group who are interested in food, vs your existing friends. If you organized a themed potluck for <eg: work / activity> people, that might yield a different group of interested folks than those you currently hang out with.
The reality of this is that if something doesn’t already exist that you can draw on, you are probably looking at putting it together yourself (and possibly hosting, at least in the early days). That’s a good amount of commitment, and real work to organize and execute. It will be time well-spent at the end of the day, but better to go in knowing that so you don’t get frustrated down the road by the effort you are putting in. I wish you the best, and hope you find many like-minded folks to have delicious meals with!