Preheat your oven to 350°F (175°C). Grease a9x5-inch loaf pan. In a large mixing bowl, mash the ripe bananas with a fork. Add the melted butter and vanilla extract to the mashed bananas, stirring until well combined. Add the sugar and brown sugar to the batter and stir until well blended.
Add the baking soda into the flour, then combine into the wet mixture mixing until just incorporated. Be careful not to over-mix; a few lumps are okay. Pour the banana bread batter into the prepared loaf pan.
In a separate bowl, prepare the Cinnamon Crunch Topping by combining the flour, brown sugar, and ground cinnamon. Add the cold butter pieces and use your fingers or a fork to incorporate until the mixture resembles coarse crumbs.
Sprinkle the topping over the batter. Bake in the preheated oven for 60-70 minutes, or until a toothpick inserted into the center comes out mostly clean but with moist crumbs attached. Do not over-bake.
Remove, sit in pan for 10 minutes, then remove and sit loaf on a cooling rack for the rest of the time to stay moist. Slice when cool.
For banana bread muffins you would bake at 350 for 18 minutes or until middle touched gently springs back, cool on cooling rack.