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 blended.
03 - Add eggs and vanilla extract to the bowl, mixing until the batter is smooth and cohesive.
04 - In a separate bowl, thoroughly combine all-purpose flour, baking powder, and salt.
05 - Gently fold the dry ingredients into the wet mixture, mixing only until just combined to avoid overworking the batter.
06 - Pour the prepared batter into the baking pan and use a spatula to level the surface.
07 - Bake for 22 to 25 minutes, or until the edges are set and a toothpick inserted in the center yields a few moist crumbs.
08 - Allow brownies to cool fully in the pan before glazing.
09 - Whisk together powdered sugar, strawberry puree, and optional lemon juice until the glaze is smooth and pourable.
10 - Spread the glaze evenly over the cooled brownies. Let set for 15 minutes, then cut into squares and serve.