Instructions:

1. Preheat the oven: Set your oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan.
2. Prepare the brownie batter: In a saucepan over medium heat, melt the butter. Remove from the heat and stir in the sugar until well combined.
3. Add the eggs and vanilla: Beat in the eggs one at a time, mixing thoroughly after each addition. Stir in the vanilla extract.
4. Combine the dry ingredients: In a separate bowl, whisk together the flour, cocoa powder, salt, and baking powder. Gradually add the dry mixture to the wet ingredients, stirring until just combined. Fold in the chocolate chips.
5. Bake the brownie cake: Pour the batter into the prepared pan and spread it evenly. Bake for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
6. Prepare the ganache: In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Remove from heat and add the chopped chocolate, stirring until smooth.
7. Top the brownies: Once the brownie cake has cooled slightly, pour the ganache over the top, spreading it evenly. Let it set before serving.