Preheat the oven to 350 degrees F.
Line a brownie (9x9) pan with parchment paper or A LOT of butter.
Add melted butter to a mixing bowl. Whisk in the sugar until smooth and combined.
Then, add eggs and vanilla extract. Mix until combined, roughly 1 minute.
Add your melted chocolate and whisk until smooth and combined.
Using a rubber spatula, stir in flour, cocoa powder, and salt until just combined. If desired, add chocolate chips.
Pour brownie batter into prepared pan and use rubber spatula to create a smooth, even layer.
Place in oven and cook for 30 minutes. Let cool in pan for at least 30 minutes. Remove and be sure they are totally cool before covering in cream cheese icing and sprinkles, bats, and pumpkins!
Slice into desired size of pieces and enjoy!