Prepare the Cake Batter
Preheat your oven to 350°F (175°C) and grease the baking dish.
In a bowl, whisk flour, sugar, baking powder, baking soda, and cinnamon.
Combine almond milk, oil, vanilla, and vinegar in another bowl; mix well.
Gradually mix wet ingredients into dry ingredients, creating a smooth batter.
Make the Crumble Topping
Mix brown sugar, flour, cinnamon, and vegan butter in a bowl until crumbly.
Assemble and Bake
Pour cake batter into the baking dish and evenly sprinkle the crumble on top.
Bake for 35 minutes or until a toothpick comes out clean.
Cool slightly before slicing and serving.