01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper.
02 - In a large bowl, whisk together melted butter, granulated sugar, and strawberry puree until thoroughly combined.
03 - Add eggs and vanilla extract to the wet mixture and mix until smooth.
04 - In a separate bowl, combine all-purpose flour, baking powder, and salt. Whisk until evenly blended.
05 - Gently fold the dry mixture into the wet mixture until just combined. Avoid over-mixing.
06 - Transfer the batter into the prepared baking pan and smooth the surface with a spatula. Bake for 22 to 25 minutes, or until edges are set and a toothpick inserted in the center emerges with a few moist crumbs.
07 - Allow brownies to cool completely in the pan before glazing.
08 - In a small bowl, whisk together powdered sugar, strawberry puree, and optional lemon juice until smooth and pourable.
09 - Spread glaze over cooled brownies. Allow to set for 15 minutes, then cut into squares and serve.