Creating the Chocolate Brownie Cake is a straightforward process with these simple steps:

1. Preheat your Oven: Set your oven to 350°F (175°C) and grease a 9×13-inch baking pan.
2. Melt the Butter: In a medium saucepan, melt the butter over low heat. Once melted, remove from heat and let it cool slightly.
3. Mix in Sugar and Eggs: Stir in the granulated sugar, mixing until well combined. Add the eggs one at a time, mixing thoroughly after each addition. Then, stir in the vanilla extract.
4. Combine Dry Ingredients: In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
5. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until smooth. Do not overmix.
6. Add Chocolate Chips: If using, gently fold in the chocolate chips for added richness.
7. Pour into Pan: Spread the batter evenly into the prepared baking pan.
8. Bake: Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
9. Cool: Once baked, remove the pan from the oven and let it cool in the pan for about 10-15 minutes before transferring to a wire rack to cool completely.
10. Serve: Dust with powdered sugar for a finishing touch or enjoy as is!