There’s something deeply nostalgic about a slice of Old-Fashioned Oatmeal Cake ... this cake is pure comfort food—the kind of recipe that feels like a warm hug from grandma’s kitchen.

Cover with plastic wrap or a towel and let rise until doubled, about 1 hour. Pour 1/2 cup old-fashioned oats into a food processor; pulse until fine-ground. Pour ground oats into a large bowl and ...