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. Whisk until the mixture is smooth and well incorporated.
04 - In a separate bowl, whisk all-purpose flour, baking powder, and salt together.
05 - Fold the dry ingredients into the wet mixture just until combined. Avoid over-mixing for best texture.
06 - Pour the batter into the prepared pan and smooth the top using a spatula.
07 - Bake for 22 to 25 minutes, or until edges are set and a toothpick inserted in the center emerges with a few moist crumbs.
08 - Allow to cool completely in the pan before adding glaze.
09 - In a bowl, whisk together powdered sugar, strawberry puree, and optional lemon juice until the glaze is smooth and pourable.
10 - Spread glaze evenly over cooled brownies. Allow glaze to set for 15 minutes, then cut into squares and serve.