This vegan plum streusel cake is a German speciality with three delicious layers. It's crumbly, fruity, sweet and tart.
Preheat your oven to 160°C (140°C for fan ovens) and line an 18x24cm baking tray.
Prepare your 'chia egg' by adding the chia seeds and water to a small bowl. Mix well then set aside for a few minutes to allow the seeds to soak up the liquid.
In a large bowl, mix together the plant-based milk, apple sauce, lemon juice and vanilla. Stir in the chia egg.
Add in the oat flour and baking powder, and stir to make a cake batter. Pour the batter into your tray and bake for 10 minutes.
While the base is baking, prepare the streusel by mixing the oat flour, almond flour, cinnamon and agave syrup together with your hands.
Spread the plum pieces evenly onto the base once it's done baking. Top with the streusel and bake for another 35 minutes or so, until the top is golden brown.
Leave to cool slightly before serving.