Banana Nut Blondies

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1. 1
   Position a rack in the center of the oven and preheat to 350ºF. Coat an 8 × 8-inch baking pan with cooking spray. Line the pan with a strip of parchment paper that hangs over two of the edges.
2. 2
   In a large bowl, whisk the melted butter, brown sugar, banana, vanilla, and salt until combined, about 30 seconds.
3. 3
   Whisk in the baking powder and baking soda. Fold in the flour and ½ cup (55 g) of the walnuts with a spatula and mix until well combined. The batter will be very thick.
4. 4
   Spoon the batter into the prepared pan and spread in an even layer. Sprinkle the remaining ¼ cup (28 g) walnuts on top.
5. 5
   Bake the blondies until slightly puffed and golden and a tester inserted into the center comes out clean, 25 to 30 minutes.
6. 6
   Let the blondies cool in the pan on a rack for about 15 minutes, then use the parchment paper to lift the cake out and onto the rack to cool completely before slicing. Store loosely covered at room temperature or in the fridge for up to 3 days.