01 - 
                Blend the blueberries until smooth to create a puree.
              
              
              
                02 - 
                Pour the blueberry puree into a saucepan and cook over medium-low heat. Gently simmer, stirring constantly, until it reduces to about 1/2 cup. Remove from heat and let the reduction cool completely.
              
              
              
                03 - 
                Preheat your oven to 325°F (163°C). Line an 8x8 glass baking dish with parchment paper, leaving overhang on the sides for easy removal.
              
              
              
                04 - 
                In a medium bowl, combine the melted butter and sugar. Stir in eggs, vanilla extract, and salt until well combined and uniform in color. Fold in the cooled blueberry reduction.
              
              
              
                05 - 
                Gradually add the sifted flour to the wet mixture, stirring until just combined. Don't overmix.
              
              
              
                06 - 
                Pour the batter into the prepared baking dish, spreading it evenly. Bake on the middle rack for 35-40 minutes (check at 30 minutes) until the center is set and a toothpick inserted comes out clean or with a few crumbs.
              
              
              
                07 - 
                While the brownies cool completely, mix the sifted powdered sugar, milk, vanilla extract, and salt until smooth and silky.
              
              
              
                08 - 
                Spread half the glaze evenly over the completely cooled brownies. Once it has hardened, spread on the remaining glaze and allow it to harden as well.
              
              
              
                09 - 
                Cut the brownies into 16 squares. Store any leftovers in an airtight container.