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* Preheat oven to 350°F (175°C). Grease and flour an 8×8 inch baking pan.
Make the Brownies:
* In a large bowl, whisk together the sugar, sour cream, butter, eggs, and vanilla extract until smooth.
* In a separate bowl, whisk together the flour, baking soda, and salt.
* Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
* Stir in the mashed bananas, walnuts (if using), and chocolate chips (if using).
* Pour the batter into the prepared pan and spread evenly.
Bake:
* Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
* Let the brownies cool in the pan for about 10 minutes before cutting and serving.
Make the Glaze (Optional):
