Preheat your oven to 350 degrees F and spray a 13x9 baking dish with cooking spray or grease with butter and set aside.

In a medium bowl whisk together the dry ingredients (flour, baking powder, cinnamon and nutmeg).

In a large bowl mash bananas until they become very liquidy. Mix in softened butter until combined and stir in sugar, eggs and vanilla until mixed very well.

Stir in half the milk, then half the flour and repeat until all is combined. Set aside while you make the crumb topping.

To make the crumb topping, combine all the ingredients together cutting them together with a fork or pastry cutter until a pea sized crumbs form.

Pour half of the batter into the prepared pan. Then pour a third of the crumb mixture. Cover the crumb mixture with the remaining cake batter and top with remaining crumb mixture.

Bake for 40-45 minutes or until a toothpick comes out clean and sides are nicely browned. Cool for at least 20 minutes before glazing.

For glaze, whisk powdered sugar and milk together and drizzle on top. Enjoy!