Are potato chip sandwiches Canadian? I guess that explains why I put potato chips in my sandwiches (sometimes), but it's usually in addition to whatever protein is in there. It's never just potato chips as the filling. Does it still count as a potato sandwich? I also put french fries in my filet o' fish and hamburgers when I go to McD's, but that's also an addition, not the star. When most people make potato chip sandwiches, do they use plain potato chips, or can you use flavoured potato chips, too? ← I always had bbq chips (Humpty Dumpty) on my PNB sandwiches..still do sometimes.