Preheat your oven to 350°F (175°C).
Grease and line a baking pan (9x13 inches) with parchment paper.
In a medium saucepan, melt the butter over low heat, then stir in the cocoa powder until smooth.
Remove from heat and whisk in sugar, eggs, and vanilla extract until well blended.
Sift in flour, baking powder, and salt, folding gently until just combined.
Carefully fold in the chopped strawberries, making sure they’re evenly distributed.
Pour the batter into the prepared pan, smoothing the top with a spatula.
Bake for 25-30 minutes, until a toothpick comes out with moist crumbs.
Allow brownies to cool completely in the pan before cutting into squares.