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Oats are widely considered chametz andaretherefore forbidden during Passover. To Jews whoeatkitniyot, legumes are considered kosherforPassover.
Subsequently, one may also ask, what foods are forbidden during Passover?
While many Ashkenazi Jews won't eat legumes, corn,rice,most other grains or products made from them, Sephardic Jewsaremore lenient. Most Jews eschew the "the five species ofgrains"— wheat, rye, oats, barley and spelt, all of whichcontaingluten.
Thereof, is oatmeal a Kitniyot?
They restrict any use of the "five grains" —wheat,spelt (whatever spelt is), barley, oats and rye— thatstart to "rise" (i.e., ferment) on their own when putin contactwith water. Keeping kosher for Passover — nograins, and yes,no kitniyot either — is the mostJewish thing Ido.
Too much of the ever-versatile matzo can sit like abrickin your stomach, and most kosher-for-Passover potatochipsand flavored crackers contain MSG, plus not-great-for-youcottonseedoil. Or even real French fries; potatoes are yourfriendduring Passover.