Preheat the oven to 350°
Butter a 9x13 baking dish and then set aside
Melt the butter until is is golden, about 3 to 5 minutes. Don't let it scorch -- set it aside to cool.
In a medium bowl whisk together flour, baking powder and salt.
Pulse the bananas in a food processor or blender until they are liquid. Pour into a large bowl.
Mix in butter until combined and then stir in sugar, eggs and vanilla until mixed well.
Stir in milk and flour mixture until combined. Don't overmix.
Crumb Filling/Topping
Prepare crumb filling/topping by cutting the cold butter into the sugar and flour until coarse crumbs form. Use two knives or pulse quickly in a food processor.
Stir in the pecans.
Pour ½ of the batter into the prepared pan.
Top with ⅓ of the crumb mixture.
Cover the filling with the remaining batter and top with remaining crumb mixture.
Bake for 50-55 minutes until the center is set and a toothpick comes out clean.
Cool for 10 minutes.