Preheat oven to 350.
Prepare brownie mix according to package directions.
Add in mashed bananas and walnuts. Mix well.
Pour mixture into a 8 x 8 inch square pan and bake for 30-35 minutes.
Let brownies cool completely then frost with maple glaze.
Combine warmed glaze and extract. Let cool until slightly thickened and drizzle over Banana Walnut Brownies.