Melt the Butter:In a microwave-safe bowl, melt the unsalted butter in the microwave in 30-second intervals until completely melted.
Mix in the Sugar:Add the granulated sugar to the melted butter and stir until well combined.
Add Cocoa Powder and Vanilla:Stir in the unsweetened cocoa powder and vanilla extract until smooth and creamy.
Incorporate Dry Ingredients:Gradually add the all-purpose flour and salt to the mixture, stirring until fully incorporated and no lumps remain.
Adjust Consistency:If the batter is too thick, gradually add milk or cream, one tablespoon at a time, until you reach your desired consistency. The batter should be smooth and spreadable but not too runny.
Optional Add-Ins:Fold in chocolate chips, nuts, or sprinkles for added flavor and texture, if desired.
Serve and Enjoy:Transfer the edible brownie batter to a serving bowl or individual cups. Serve immediately with a spoon for scooping and enjoy!