Chunky Monkey Bars

Instructions

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1. 1 Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 10x15x1-inch baking pan.
2. 2 Whisk together flour, baking soda, and salt in a bowl; set aside.
3. 3 Beat brown sugar, butter, and granulated sugar in a large bowl with an electric mixer until smooth and creamy.
4. 4 Add eggs 1 at a time, beating well after each addition. Mix in mashed bananas, sour cream, and vanilla until well combined.
5. 5 Gradually add the flour mixture to the batter, stirring just until combined.
6. 6 Fold in 1 1/4 cups chocolate chunks and 1/2 cup chopped walnuts.
7. 7 Spread batter evenly into the prepared pan.
8. 8 Top with the remaining 1/4 cup chocolate chunks and 1/4 cup chopped walnuts.
9. 9 Bake until a toothpick inserted into the center comes out clean, 20 to 25 minutes.
10. 10 Cool completely in the pan on a wire rack, about 30 minutes. Cut into 24 bars.