Banana-Chocolate Chip Bread

My cute neighbor Katie brought this delicious bread over the other night and I devoured it for breakfast the next day. It is the most delicious banana chocolate chip bread I've ever had! She got it from CuisineNie, which is an adorable blog in and of itself! Enjoy!
Ingredients
1/2 cup (1 stick) butter, at room temperature, plus more for pan
1 cup granulated sugar
2 large eggs
1 1/2 cups whole-wheat flour
1 teaspoon baking soda
1 teaspoon salt
1 cup mashed very ripe bananas
1/2 cup sour cream
1 teaspoon vanilla
1 cup chocolate chips (if desired)

Directions
1. Preheat oven to 350 degrees;. Butter a 9-by-5-by-3-inch loaf pan; set aside. In an electric mixer fitted with the paddle attachment, cream butter and sugar until light and fluffy. Add eggs, and beat to incorporate.
2. In a medium bowl, whisk together flour, baking soda, and salt. Add to the butter mixture, and mix until just combined. Add bananas, sour cream, and vanilla; mix to combine. Stir in chocolate chips and pour into prepared pan.
3. Bake until a cake tester inserted into the center of the cake comes out clean, about 1 hour 10 minutes. Let rest in pan for 10 minutes, then turn out onto a rack to cool.