This is an easy to make cake made with Herman starter. The addition of starter makes this cake light and moist. The thin layer of streusel toppings adds a nice crunch enhancing the contrast between the sweet and tart flavors.
Here is an easy to make basic sourdough starter recipe. Flour and water are all it takes to make incredible starter from scratch. Once you master this vary the flour and liquid components to create more nuanced flavors.