Preheat oven to 350 degrees.
Mash bananas in a large bowl. Add melted butter, brown sugar, vanilla and milk and mix together.
In a separate bowl, mix together flour, baking soda, baking powder, salt, and cinnamon.
Add the dry ingredient mixture to the the wet ingredient mixture 1/3 cup at a time and mix until combined.
Add batter to a greased or lined loaf pan.
In a small bowl, mix all crumble ingredients - add more flour if needed. Add the crumble mixture across the top of the bread batter with your fingers. Bake at 350 for 45-50 minutes!