Potato flakes
wheat flakes
Generally well tolerated, provided they contain no additives.
Caution
May cause symptoms in more sensitive people. Track your own reaction.
Wheat is considered a low-histamine food, for sensitive individuals, it is necessary to monitor their individual response (most commonly reported in the SIGHI list as bloating).
Safer alternatives
Suitable
whole grain rye flour
Generally well tolerated if fresh.oats
Oats can be problematic for some people.