No, we don't eat oats or oatmeal on passover. The sephardim do however eat those type of foods, including rice, starch, oats, etc.elevance. Rating Newest Oldest. Best Answer: Flour, oats and barley If one of the five grains – wheat, barley, rye, oats and spelt – sits in water for more than 18 minutes it becomes chametz, and one may not eat, derive benefit from or own it on Pesach.