01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, combine melted butter, granulated sugar, and strawberry puree. Whisk until evenly blended.
03 - Add eggs and vanilla extract to the wet mixture. Mix until fully incorporated and smooth.
04 - In a separate bowl, whisk together all-purpose flour, baking powder, and salt.
05 - Gently fold dry mixture into the wet ingredients until just combined. Avoid over-mixing the batter.
06 - Transfer batter into the prepared pan. Smooth the surface with a spatula. Bake for 22 to 25 minutes or until set at the edges and a toothpick inserted in the center yields a few moist crumbs.
07 - Allow brownies to cool fully in the pan before glazing.
08 - In a bowl, whisk powdered sugar, strawberry puree, and lemon juice, if using, until smooth and pourable.
09 - Evenly distribute glaze over cooled brownies. Let sit for 15 minutes until glaze firms.
10 - Cut brownies into 16 squares and serve as desired.