Preheat oven to 350°.

Prepare a loaf pan with a baking spray or shortening and flour. My pan is 10x5, a similar size will work, it will rise higher if your pan is smaller and may take a few more minutes to bake. It can be baked in a 13x9 pan for about 40 minutes.

In the bowl of a mixer beat the butter with brown sugar until smooth, then add in the eggs and mix to combine.

Add in the bananas, sour cream, and vanilla and mix on low to medium speed until they are incorporated.

Add in flour, baking soda, salt, mix on low to blend, then medium until well combined.

Stir the chocolate chips in by hand.

Bake in a prepared loaf pan at 350° for 1 hour 10 minutes. Be sure to set your timer a little early so you can test to see when it'll be done especially if your pan is a different size.

Allow the banana bread to cool in the pan for 15 minutes, you can remove it to slice it, or use a plastic knife to cut it in the pan without marking up the pan.