Earlier this week, Stewart shared the photo of the cake to Instagram with the caption reading, “If you love the apple-cider donuts often sold at farmers’ markets, you’ll love this cake. Baked in a ...

Helen Goh’s caramelized cinnamon doughnut cake combines mashed potatoes, brown sugar, and cinnamon for a caramelized, brioche-like treat that’s part bread, part doughnut, and completely irresistible.