Follow these easy steps to create your delicious Chocolate Brownies:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Grease a 9×13 inch baking pan or line it with parchment paper for easy removal.

2. Melt Butter: In a medium saucepan, melt the unsalted butter over low heat. Remove from heat and allow it to cool slightly.

3. Mix Sugar and Eggs: In a large mixing bowl, combine the melted butter and granulated sugar. Stir until well mixed. Then, add the eggs one at a time, mixing thoroughly after each addition. Add the vanilla extract and mix again.

4. Combine Dry Ingredients: In a separate bowl, whisk together the all-purpose flour, cocoa powder, baking powder, and salt.

5. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined. Avoid overmixing to keep the brownies fudgy.

6. Add Chocolate Chips and Nuts: If desired, fold in the semi-sweet chocolate chips and chopped nuts for added texture and flavor.

7. Pour Batter into Pan: Pour the brownie batter into the prepared baking pan, spreading it evenly.

8. Bake: Place the pan in the preheated oven and bake for 25-30 minutes. Check for doneness by inserting a toothpick into the center; it should come out with a few moist crumbs.

9. Cool: Once baked, remove the pan from the oven and let the brownies cool in the pan for about 15 minutes. Then, transfer them to a wire rack to cool completely.

10. Cut and Serve: Once cool, cut the brownies into squares or rectangles. Enjoy them as is, or add your favorite toppings!