In the olden days....whenever that was.... the Irish and Scots used oatmeal extensivly in all their cooking.
Oatmeal, it wasn't just for breakfast, way back then.
It was really the main staple of the diet for those people, before the potato was introduce in Ireland. It is still quite vital in Scotland. Think Haggis and Oatcakes.
or maybe not.
My husband tells a story of a friend visiting his extended family in Scotland and being served "porridge" in the morning. He began to dump huge quantities of the gradulated white stuff which was sitting in a bowl on the table onto the oatmeal. His uncle watch this spectacle for a moment, and said "You know Davey, in Scotland, we put SALT on our oatmeal." Davey replied "I don't care, I eat mine with lots of sugar." The uncle made him eat every bite of his creation.
Our living history group has used oatmeal, particularly leftover oatmeal, in soups with chicken and kale and onions. It's quite good.