Creating these Spooky Spiderweb Brownies is an enjoyable process. Here are the steps to follow:

1. Preheat Your Oven: Start by preheating your oven to 350°F (175°C). Prepare a 9×13-inch baking pan by greasing it or lining it with parchment paper.
2. Melt the Butter: In a medium saucepan over low heat, melt the unsalted butter until completely liquefied.
3. Mix Sugar and Eggs: Remove the saucepan from heat. Whisk in the granulated sugar until fully combined. Then, add the eggs one at a time, mixing in between. Stir in the vanilla extract.
4. Combine Dry Ingredients: In a large bowl, sift together the flour, cocoa powder, salt, and baking powder.
5. Blend Mixtures: Gradually add the dry ingredients to the butter-sugar mixture. Stir until the batter is smooth and well-combined.
6. Add Chocolate Chips: Fold in the semi-sweet chocolate chips for added richness.
7. Pour Batter: Pour the brownie batter into the prepared baking pan, spreading it evenly.
8. Bake: Place the pan in the preheated oven and bake for 30-35 minutes. Use a toothpick to check if done; it should come out with a few moist crumbs.
9. Cool the Brownies: Once baked, remove the pan from the oven and set it aside to cool for 15-20 minutes.
10. Prepare Spiderweb: While the brownies are cooling, melt the white chocolate chips in a microwave-safe bowl. Stir until smooth and add black food coloring if desired.
11. Create the Web: Transfer the melted white chocolate to a piping bag or a zip-top bag with a tiny hole cut in one corner. Drizzle the chocolate over the cooled brownies in a spiral pattern, then let cool for a few minutes to set.
12. Finish the Design: Using a toothpick, drag through the white chocolate to create the spiderweb effect. This will add a touch of spookiness!
13. Slice and Serve: Once cooled and decorated, slice the brownies into squares for serving.

Following these straightforward steps will allow you to enjoy mouthwatering Spooky Spiderweb Brownies, sure to elevate any festive gathering!