01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, whisk together melted butter, granulated sugar, and strawberry puree until thoroughly combined.
03 - Mix eggs and vanilla extract into the wet mixture until smooth and fully integrated.
04 - In a separate bowl, whisk all-purpose flour, baking powder, and salt until well blended.
05 - Fold the dry ingredients into the wet batter, mixing just until no streaks of flour remain. Do not overmix.
06 - Spread batter evenly into the prepared pan and smooth the surface with a spatula.
07 - Bake for 22 to 25 minutes, or until the edges are set and a toothpick inserted in the center emerges with a few moist crumbs.
08 - Allow to cool completely in the pan on a wire rack.
09 - In a bowl, whisk powdered sugar, strawberry puree, and optional lemon juice until glaze is smooth and pourable.
10 - Spread the glaze evenly over cooled brownies. Let stand 15 minutes to set before cutting into squares.