Preheat oven to 350°.
Using standmixer, hand mixer, or by hand combine both sugars and butter together for 2 minutes or until fully combined.
Sift together flour, baking soda, baking powder, and salt in a larger bowl.
Next add sour cream and vanilla extract to sugar and butter mixture until fully combined.
Add in 1/3 cup of dry ingredients to wet and mix until fully combined.
Add in 1 egg and mix until fully combined.
Repeat steps 5 and 6 until all gone.
Next in a big bowl mash bananas and add to everything else and mix until fully combined.
Next grease 2 loaf pans and add banana bread mix evenly into both pans.
Melt cookie butter in a small bowl and swirl on top of banana bread.
Bake banana bread for 45-50 minutes.
When done and toothpick comes out clean cool for 15 minutes and then take out of pan and then cool completely.
Make sure to wait until fully cooled to cut it.
Next cut the banana bread into slices.