Any Gluten Free people out there - Bernese Oberland

When we stop hiking for lunch, I usually choose the Rösti ( hash-brown potato pancake, no flour at all), a mixed salad, or a “fitness Teller” (usually a grilled chicken breast with side salad). You will find the Rösti at nearly every mountain hut; it may be offered with our without a topping of cheese, or fried egg, or a sausage on the side. I just get the “Rösti Natur” which is plain. There may be safe (pasta-free) soup options as well.

If you are in Mürren around lunchtime, there is a nice little Asian restaurant on the Main Street (Tham’s). They will have some good wheat-free options. Not traditional Swiss food, but it is still “local”, and a good option to get some vegetables.

Do watch out regarding rösti, because some regions add a sprinkling of flour... I do not know what the custom is in the Berner Oberland, so you'd better ask!
Raclette is more common over the mountains in the Valais, but if you find it, that's definitely safe as it's basically boiled potatoes and melted cheese.

Thank you! I wasn’t sure about the rosti So I will be sure to ask.

I did not realize that the raclette was with potatoes. For some reason I thought it was served with bread like fondue

Raclette can come with lots of accompanying side dishes, and boiled new potatoes can be one of those. Google raclette side dishes.
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But I do enjoy being at festivals and purchasing a hearty slice of bread with a healthy smear of Raclette and finished with a nice grind of pepper.

also with the small potatoes Raclette will often have a gherkin or 3 for plate-mates...

Yes, I was going to recommend Raclette as well.

Also, if you are camping, you can make your own meals, and thus you can read the ingredients of what you buy. (Wouldn't hurt to learn a few German words like flour, gluten, etc. Still, a phone camera app that translates on the fly would be handy: https://www.guidingtech.com/60504/live-translations-apps-camera/ ) There are decent size stores in Lauterbrunnen, Murren, Wengen, and Grindelwald. In Interlaken Ost, there is a HUGE Coop store across the street from the train station.

Since you are camping, have you considered the campgrounds in Grindelwald and Lauterbrunnen? If you can get a spot IN the mountains it saves time and money traveling back and forth to Interlaken. My then 13 yr old daughter and I camped at
https://www.campingjungfrau.swiss/ and loved it.

Finally, if you're doing hiking, you should look up https://lauterbrunnenhiking.wordpress.com/ We've taken all those hikes. In fact, my daughter (now an adult) is in several of those pictures.