Follow these simple steps to create your Spooky Mummy Brownies:

1. Preheat the Oven: Preheat 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 the Butter: In a large saucepan, melt the butter over low heat. Remove from heat and stir in the sugar until well combined.
3. Add Eggs and Vanilla: Whisk in the eggs, one at a time, along with the vanilla extract. Blend until smooth.
4. Combine Dry Ingredients: In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
5. Blend Mixtures: Gradually add the dry ingredients into the wet mixture, stirring gently just until combined. Be careful not to overmix.
6. Pour into the Pan: Pour the brownie batter into the prepared baking pan, spreading it evenly with a spatula.
7. Bake the Brownies: Bake in the preheated oven for 25-30 minutes or until a toothpick inserted comes out with a few moist crumbs.
8. Cool the Brownies: Remove the brownies from the oven and allow them to cool in the pan for about 30 minutes before transferring to a wire rack to cool completely.
9. Prepare the White Chocolate: In a microwave-safe bowl, combine the white chocolate chips and vegetable oil. Heat in the microwave in 30-second intervals until melted and smooth, stirring in between.
10. Decorate the Brownies: Once the brownies are completely cooled, cut them into squares. Drizzle the melted white chocolate over the brownies in a crisscross pattern to resemble mummy wrappings.
11. Add the Eyes: Place two candy eyes on each brownie to complete your spooky mummies.

These simple steps will have you mastering the art of creating Spooky Mummy Brownies that will delight everyone at your Halloween gathering!