Preheat your oven to 350°F (175°C). Line your 9x9-inch baking pan with parchment paper or lightly grease it with non-stick spray.
In a medium bowl, sift together the unsweetened cocoa powder, all-purpose flour, baking powder, and salt. Set this bowl aside.
In a large bowl, whisk the granulated sugar, brown sugar, and melted butter until smooth and combined.
Beat in the eggs one at a time, making sure each one is fully incorporated before adding the next. Then stir in the vanilla extract.
Gradually fold the dry ingredients into the wet mixture using a spatula. Stop mixing as soon as the dry ingredients disappear.
Gently fold in the chocolate chips to distribute them evenly throughout the batter.
Pour the batter into your prepared pan and spread it evenly. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Allow your Hot Chocolate Brownies to cool completely in the pan on a cooling rack before slicing. Serve alone or with a scoop of ice cream if desired.