Place the butter in a small saucepan over medium heat. Let it start foaming and bubbling. Stir all the time with a spoon or a silicon spatula. If needed lower the heat. The milk solids will start browning after 5-10 minutes. As soon as they have a light caramel color, remove the pan from the heat and pour the brown butter into a large mixing bowl. Let cool for 5 minutes.
Preheat the oven to 350° F/ 180° C. Line a small baking pan (9 x 7 inch / 23/ 20 cm or similar) with a sheet of parchment paper so the two opposite sides hang. Grease the pan on top of the paper.
Add the brown sugar into the bowl with the brown butter. Whisk until blended. Add the eggs and the vanilla extract and whisk again until smooth.
In a small bowl mix the flour with the baking powder and the salt. Stir to blend. Using a rubber spatula gently fold the mixture into the batter.
At the end fold also the walnuts and the chopped white chocolate into the blondies mixture.
Pour the batter into the prepared pan. Bake for about 20-25 minutes or until the center is set and the edges start to become golden brown. Test with a toothpick at about the 20th minute: it should come clean or with just a few crumbs.
Let the dessert cool for 15 minutes before cutting it into bars and serving.
Notes
Store the blondies for 2-3 days covered at room temperature or 5-7 days in the fridge.Make sure you don't overbake the blondies as they will become dry.
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