Step 1

Whisk together flour and baking soda in a large bowl and set aside.  Combine melted butter, sugar, sour cream, eggs, bananas and vanilla extract.  Stir together with a spoon.  Add to flour mixture and mix well with spoon.  Spray a 9 x 5 loaf pan with cooking spray and add batter to pan. Add swirl.

Step 2

Combine and spread on top of the banana batter.  Take a knife and swirl into batter. Bake in preheated 350 degree oven 65 to 70 minutes checking until done as ovens vary. It took mine 70 minutes to cook. Remove from oven and let cool. Drizzle on topping below.

Step 3

Whisk together and drizzle over cooled banana bread.