This recipe creates classic cake doughnuts with a tender crumb, flavored with vanilla. The dough uses a combination of buttermilk and yogurt for a soft texture, shaped and deep-fried to golden perfection. They are ideal for a quick breakfast treat or a delightful snack, especially when coated with a sweet finish.
For optimal cake doughnut texture, grate the frozen butter directly into the dry ingredients, then quickly work it in. This prevents overworking the dough and ensures tenderness. Avoid overmixing once wet and dry ingredients are combined; mix just until no dry streaks remain to prevent tough doughnuts. Maintaining the correct oil temperature (ideally 350-375°F or 175-190°C) is paramount for frying: too cool leads to greasy doughnuts, too hot results in raw centers and burnt exteriors. Use a deep-fry thermometer. After frying, drain on a wire rack to prevent sogginess. For the 'cinnamon vanilla' element, prepare a simple cinnamon-sugar mix for tossing warm doughnuts, or a quick vanilla glaze.