Preheat oven to 175°C (350°F) and line an 8×8-inch (20×20 cm) baking pan with parchment paper.
Mix wet ingredients: In a bowl, whisk together the melted butter, sugar, eggs, and vanilla until smooth.
Sift dry ingredients: In another bowl, sift together flour, cocoa powder, salt, and baking powder.
Combine: Gradually mix the dry ingredients into the wet mixture until just combined (do not overmix). Stir in chocolate chips if using.
Bake: Pour the batter into the prepared pan and bake for 20-25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Cool & Serve: Let brownies cool completely before slicing into squares.

Enjoy your rich, fudgy chocolate brownies! 😋🍫

Would you like variations, like nutty brownies or caramel swirl brownies? 😊