01 - Preheat oven to 350°F. Grease and line an 8x8-inch baking pan with parchment paper for easy removal.
02 - In a large bowl, whisk together melted butter, granulated sugar, and strawberry puree until thoroughly blended.
03 - Add eggs and vanilla extract to the wet mixture. Whisk until the mixture is smooth and homogenous.
04 - In a separate bowl, combine flour, baking powder, and salt. Stir to evenly distribute the leavening agent and salt.
05 - Gently fold the dry ingredient mixture into the wet mixture until just incorporated. Avoid overmixing to ensure a tender crumb.
06 - Transfer the batter to the prepared pan and smooth the surface with a spatula to ensure even baking.
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 to cool completely in the pan to ensure clean slicing and optimal glaze adhesion.
09 - In a small bowl, whisk powdered sugar with strawberry puree (and lemon juice, if using) until the glaze is smooth and pourable.
10 - Evenly spread strawberry glaze over the cooled brownies. Let set for 15 minutes before cutting into squares and serving.