Preheat your oven to 350°F (175°C) and prepare a 9x13-inch baking pan by lining it with parchment paper.

Melt the butter gently in a medium saucepan over low heat until fully liquefied, then stir in granulated and brown sugar until smooth.

Allow the butter-sugar mixture to cool slightly, then add eggs one at a time, mixing thoroughly after each addition. Pour in vanilla extract.

Sift together flour, cocoa powder, and salt in a separate bowl, then gradually add to the wet ingredients, mixing gently until just combined.

Fold chocolate chips into the brownie batter using a spatula.

Pour the batter into the prepared pan and bake for 30–35 minutes, checking for doneness with a toothpick.

Cool the brownies in the pan for 15 minutes, then transfer to a wire rack to cool completely.

Melt chocolate chips with coconut oil in a microwave-safe bowl, stirring until smooth to make the ganache.

Pour the ganache over the cooled brownies, spreading evenly, then let it set. Use gel food coloring for decoration and finish with sprinkles.