Preheat your oven to 350°F (175°C). Prepare a 9x13 inch baking pan by greasing it lightly or lining it with parchment paper for easy removal after baking.
In a large mixing bowl, whisk together the melted butter and granulated sugar until you achieve a smooth and creamy consistency.
Add the eggs to the mixture one at a time, ensuring to mix well after each addition. Then, stir in the pure vanilla extract until well incorporated.
In a separate bowl, sift together the all-purpose flour, cocoa powder, baking powder, and salt. This will help to aerate the dry ingredients.
Gradually add the dry mixture to the wet mixture, stirring gently until just combined. Be careful not to overmix, as this can result in dense brownies.
Carefully fold in the chocolate chips for a rich, chocolatey flavor throughout the brownies.
Pour the brownie batter into the prepared baking pan. Use a spatula to spread the batter evenly across the pan.
Bake in your preheated oven for 25-30 minutes. To test for doneness, insert a toothpick into the center; it should come out with a few moist crumbs, but not wet batter.
Once baked, allow the brownies to cool completely in the pan for at least 30 minutes to set properly.
After cooling, cut the brownies into evenly sized squares and carefully transfer them to a serving plate.
Decorate each brownie square by placing a gummy eyeball right in the center. For an extra spooky touch, sprinkle edible glitter around the brownies, creating a magical Halloween vibe.
Notes
For a delightful Halloween atmosphere, arrange the brownies on a black or orange serving platter.