Preheat your oven to 350°F (175°C) and grease a heart-shaped brownie pan.

Melt the butter in a microwave-safe bowl and let it cool slightly. Stir in granulated and brown sugars until fully combined.

Add eggs and vanilla extract, mixing until smooth.

In another bowl, whisk together flour, cocoa powder, baking powder, and salt. Gradually fold the dry mixture into the wet ingredients until just combined.

Pour the batter into the prepared pan and spread evenly. Bake for 25-30 minutes or until a toothpick inserted comes out with moist crumbs.

Allow cooling for at least ten minutes before serving.