01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, blend melted butter, granulated sugar, and strawberry puree with a whisk until fully combined.
03 - Incorporate eggs and vanilla extract into the wet mixture and whisk until smooth.
04 - In a separate bowl, whisk together all-purpose flour, baking powder, and salt.
05 - Gently fold the dry ingredients into the wet batter until just incorporated, avoiding overmixing.
06 - Pour the batter 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 brownies to cool fully in the pan.
09 - Whisk powdered sugar with 2 to 3 tablespoons strawberry puree and optional lemon juice until glaze is smooth and pourable.
10 - Spread glaze over the cooled brownies, allow to set for 15 minutes, then cut into squares and serve.