Banana Bread Coffee Cake combines the best of both worlds-moist, banana cake, layered with buttery cinnamon crumbles and sweet vanilla icing. It's the perfect treat for a cozy morning or afternoon snack!
Preheat your oven to 350℉. Spray 9x9-inch baking pan with non-stick spray. Then, line the pan with parchment paper, ensuring it covers the bottom and one side with a slight overhang so you can easily remove the cake from the pan after baking.
In a medium-size bowl, combine flour, brown sugar, cinnamon and butter. Use a dough blender until the mixture comes together and begins to form "clumps." Cover and place inside the refrigerator.
In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt. Set aside.
Whisk together the melted butter and sugar. Then, whisk in the eggs, sour cream, vanilla and mashed bananas.
Next, stir the dry ingredients into the wet ingredients. Mix with a rubber spatula just until combined. Do not over mix.
Spread half of the batter into the prepared baking pan. Then, sprinkle about half of the crumb mixture evenly on top. Gently spread the rest of the batter on top. Sprinkle the remaining crumb mixture evenly on top.
Bake the cake for 40-45 minutes or until a toothpick in the center comes out clean with a few crumbs. Remove the cake from the oven and allow it cool for 10-15 minutes.
In a small bowl, whisk the powdered sugar with vanilla extract and milk. Then, use a spoon to drizzle over the cake. Allow the icing to set before slicing.