01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper.
02 - In a large mixing bowl, whisk melted butter, granulated sugar, and strawberry puree until fully incorporated.
03 - Blend eggs and vanilla extract into the mixture until smooth.
04 - In a separate bowl, whisk together all-purpose flour, baking powder, and salt.
05 - Gently fold dry ingredients into wet mixture until just combined. Avoid overmixing.
06 - Transfer the batter to the prepared pan and level the surface with a spatula. Bake for 22 to 25 minutes, or until edges are set and a toothpick inserted in the center yields moist crumbs.
07 - Allow brownies to cool completely in the pan.
08 - In a bowl, whisk powdered sugar, strawberry puree, and lemon juice (if using) until glaze is smooth and pourable.
09 - Spread glaze evenly over cooled brownies. Let set for 15 minutes before cutting into squares and serving.