Preheat oven to 325F and grease a square baking dish or large loaf pan. A 6x8 baking dish works well. Set aside.
Add the dry ingredients to a mixing bowl and use a fork to remove any clumps.
In a separate bowl, mix coconut oil, applesauce, vinegar, and vanilla. Add wet mixture into the dry and mix, pouring in milk as you are mixing until a dough has formed.
Spread the batter into your prepared cake tin evenly with a spatula. Set aside.
In a small bowl by hand, whisk together all ingredients into a crumbly mixture with a fork or small whisk to get bigger crumbles.
Sprinkle the crumb mixture over the top of the cake batter with a spoon, leaving the crumbs as intact as possible.
Bake for 25 minutes, allow to cool and then serve!