Preheat the oven to 350 degrees. Spray a 9 x 13 pan with baking spray. Set aside.
In a medium bowl combine the flour, salt, and baking powder. Set aside.
Heat the butter over medium high heat in a skillet. Cook, swirling the skillet and stirring occasionally, until the butter is dark golden brown and smells nutty.
Remove the skillet from the heat and let cool for 5 minutes. Transfer to a large mixing bowl.
Add the brown sugar to the hot butter and whisk until combined. Add in the eggs, corn syrup, and vanilla and whisk until smooth.
Add the flour mixture to the butter mixture and stir until combined.
Fold in the pecans and chocolate chips.
Pour the batter into the prepared pan and sprinkle with sea salt.
Bake for 35-40 minutes, rotating the pan halfway through baking, until the top is golden brown.
Let the blondies cool completely. Cut into 24 bars and serve.
Notes
Recipe from Cook's Illustrated Magazine, January & February 2019.