For a full list of ingredients, check out the recipe card below. Here is how to make sourdough apple pie with oat streusel ...

Arrange a layer of apple slices over the almond cream ... Brush with butter, and sprinkle with remaining brown sugar. Remove streusel block from freezer. Using the coarsest side of a box grater ...

To keep the crumble topping crunchy, add it just before serving. If you prefer a "Dutch apple pie" vibe, this crumble is a ...