Preheat oven to 350F and line loaf pan with parchment paper and nonstick spray.
In a small bowl, mix together almond flour, baking soda, salt, and cinnamon.
In a large bowl, mash bananas until smooth. Whisk in eggs.
Stir in vanilla and coconut sugar.
Add dry ingredients to wet and stir until combined. Pour into prepared loaf tin.
In a small bowl, mix together all crumble ingredients and stir until combined.
Add to top of banana bread batter.
Bake for 50 minutes or until toothpick inserted comes out clean.