Preheat your oven to 350°F (175°C) and prepare a 9x13 inch baking pan by greasing it with butter or lining it with parchment paper.

In a large mixing bowl, whisk together the melted unsalted butter and brown sugar until smooth. Add in the eggs and vanilla extract, stirring until silky.

In a separate bowl, whisk the all-purpose flour, baking powder, and salt. Gradually add this to the wet mixture, stirring gently until just combined.

Fold in the chopped strawberries, lemon zest, and lemon juice using a spatula.

Pour the batter into the prepared pan and spread evenly.

Bake in the preheated oven for 25-30 minutes or until the top is golden and firm in the center.

Remove from the oven and allow to cool on a wire rack before slicing into bars.

Serve and enjoy, possibly with powdered sugar or whipped cream.