Preheat your oven to 350 degrees F and line an 8x8 baking dish with parchment paper.
In a bowl, combine the flour, salt, and baking powder and set it aside.
Mix the softened butter and sugar with an electric mixer for 2-3 minutes. Add the lemon zest and lemon extract and mix for a few extra seconds.
Add the eggs and mix until well incorporated but don't overmix.
Add the flour mixture and mix until well combined. Make sure to scrape the sides and bottom of the bowl.
Add the lemon juice and mix for a few seconds and then fold in the white chocolate chips.
Pour the batter into the prepared baking dish and bake for 22-25 minutes.
Allow the blondies to cool for 20 minutes. While the blondies cool, prepare the lemon glaze. To make the lemon glaze, simply mix the powdered sugar, milk, and lemon juice until well combined.
Pour the lemon glaze over the blondies and then let them cool completely. Slice them into squares, and enjoy!