Preheat the oven to 180 degrees celsius. In a cup, mix milk and apple cider vinegar together, leave to set in for 5-10 minutes.
Meanwhile, in a bowl, combine all dry cake ingredients (sugar, flour, baking powder, soda and cinnamon) and mix well.
Add in the wet ingredients (yoghurt, oil, vanilla extract & the milk mix), then mix until combined, set aside.
In another bowl, add the crumble ingredients. Combine using your hands until you get a rough, just above sandy texture. Ensure all thick parts are broken down to avoid melted butter as your topping, set aside.
In a cup, pour in vegan milk and icing sugar, and stir until combined, you should have a drizzly, creamy texture.
Pour half the mix into an oven dish, then half of the crumble, to cover the batter.
Add the rest of the batter to cover the topping evenly, then the other half of the crumble.
Bake in the oven for 30-40 minutes, testing with a fork to ensure it’s cooked through.
Let the cake cool, slice and drizzle the icing mix atop the cake.
Serve and enjoy with your favourite type of coffee!