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 fully incorporated.
03 - Add eggs and vanilla extract to the wet mixture. Mix until smooth and homogeneous.
04 - In a separate bowl, whisk flour, baking powder, and salt until evenly combined.
05 - Gently fold dry ingredients into wet mixture just until no streaks remain; avoid overmixing.
06 - Pour batter into the prepared pan and smooth the surface with a spatula.
07 - Bake for 22–25 minutes, or until the edges have set and a toothpick inserted into the center emerges with a few moist crumbs.
08 - Allow pan to cool completely on a wire rack to facilitate clean slicing.
09 - In a bowl, whisk powdered sugar, strawberry puree, and lemon juice (if using) until smooth and pourable.
10 - Spread glaze over cooled brownies. Let set for 15 minutes. Slice into squares and serve.