Begin by preheating your oven to 350°F (175°C). Prepare a 9x9 inch baking pan by greasing it lightly with non-stick spray or lining it with parchment paper to facilitate easy removal after baking.
In a large mixing bowl, whisk together the melted butter, packed brown sugar, and granulated sugar until the mixture is well combined and smooth in texture.
Incorporate the eggs into the mixture one at a time, ensuring to mix thoroughly after each addition. Then, stir in the pure vanilla extract until evenly distributed.
In a separate bowl, whisk together the all-purpose flour, baking powder, fine salt, lemon zest, and freshly squeezed lemon juice until well blended. Gradually fold this dry mix into the butter and sugar mixture, stirring gently until just combined to avoid overmixing.
Carefully fold in the diced strawberries, ensuring they are evenly distributed throughout the batter without breaking them down.
Pour the strawberry-lemon batter into the prepared baking pan, spreading it evenly to ensure consistent baking.
Bake in the preheated oven for 25-30 minutes. The blondies are done when the edges are a lovely golden brown and a toothpick inserted into the center comes out clean.
Once baked, allow the blondies to cool in the pan for about 10 minutes. After that, transfer them to a wire rack to cool completely before slicing.
Once cooled, slice the blondies into squares. Optionally, dust the top with powdered sugar for an elegant finish.
Notes
Dust with powdered sugar for an elegant finish if desired.