Preheat the oven to 350°F and line a 9x13 baking pan with parchment paper.
In a medium saucepan, melt the butter over medium heat. Continue cooking, stirring frequently, until the butter foams and turns golden brown with a nutty aroma (about 5–7 minutes). Remove from heat and let it cool for about 10 minutes.
1 cup Butter
In a large mixing bowl, beat the browned butter with brown sugar and granulated sugar until well combined. Add the eggs, vanilla, and milk, and mix until smooth.
1 cup Brown Sugar, ½ cup Granulated Sugar, 2 Eggs, 1 ½ teaspoons Vanilla Extract, ½ tablespoon Milk
In a separate bowl, whisk together the flour, salt, and baking soda. Gradually stir the dry mixture into the wet ingredients until a thick batter forms.
2 ½ cups All-Purpose Flour, ½ teaspoon Salt, 1 teaspoon Baking Soda
Gently fold in the semisweet chocolate chips and chopped pecans.
1 cup Semisweet Chocolate Chips, 1 cup Chopped Pecans
Spread the batter evenly into the prepared pan. Sprinkle coarse salt evenly over the top.
1 teaspoon Course Salt
Bake for 18–22 minutes, or until the edges are golden and a toothpick inserted in the center comes out clean or with a few moist crumbs.
Let the blondies cool completely in the pan before slicing into squares.