Creating your own Homemade Cosmic Brownies is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line a 9×13 inch baking pan with parchment paper.
2. Melt the Butter: In a medium saucepan over low heat, melt the unsalted butter. Remove from heat and let cool slightly.
3. Mix Sugars and Eggs: In a large mixing bowl, whisk together the melted butter and granulated sugar until well combined. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
4. Combine Dry Ingredients: In another bowl, sift together the all-purpose flour, cocoa powder, baking powder, and salt.
5. Combine Wet and Dry Mixtures: Gradually fold the dry mixture into the wet mixture until just combined. Be careful not to overmix.
6. Add Chocolate Chips: Gently fold in the semi-sweet chocolate chips until evenly distributed throughout the batter.
7. Pour into Pan: Pour the brownie batter into the prepared baking pan, spreading it evenly.
8. Bake: Bake in the preheated oven for 25-30 minutes. A toothpick inserted in the center should come out with moist crumbs, not wet batter.
9. Cool the Brownies: Remove from the oven and let the brownies cool in the pan for about 30 minutes.
10. Prepare Ganache: In a small saucepan, heat the heavy cream until it just begins to simmer. Remove from heat and whisk in the powdered sugar until smooth.
11. Top with Ganache: Once the brownies are cool, pour the ganache over the top, spreading it evenly.
12. Add Sprinkles: While the ganache is still wet, sprinkle colorful sprinkles on top for decoration.
13. Slice and Serve: Once the ganache has set, slice the brownies into squares and enjoy!

These steps will guide you in creating incredible Homemade Cosmic Brownies that are sure to impress!