Spread the flour in a microwave-safe bowl and heat on High power for 30 seconds. Remove bowl and stir, then return bowl to the microwave, and cook for another 30 seconds.
When the flour is cool, add the cocoa powder and salt to the bowl; stir well to combine. Set aside.
In a separate mixing bowl, use an electric hand mixer on High speed to cream together the butter, sugar, and vanilla.
Combine the flour and sugar mixtures, adding in the milk. Mix until well-combined.
Fold in the chocolate chunks if desired and enjoy!
Notes
Bake the flour - If you prefer to bake the flour instead of using the microwave, that’s perfectly fine. Simply spread it on a baking sheet and bake at 350 degrees Fahrenheit for 5 minutes. Allow to cool completely before adding it to the recipe.
Does it need an egg? - Since you’re not baking this batter, the egg isn’t necessary. It’s not safe to eat raw eggs anyway since you can get salmonella from them.
Make it vegan or dairy free brownie batter - Simply use almond milk in place of whole milk, and use vegan butter and you’ve got a vegan-friendly recipe!