If you are not using store-bought heat-treated flour, spread 1/2 cup of flour on a baking sheet and bake at 350°F (175°C) for 5 minutes, or microwave on high for 1 minute 30 seconds. Let it cool completely before using.
In a medium bowl, whisk together the heat-treated flour, cocoa powder, granulated sugar, brown sugar, and salt.
Add the melted butter, milk, and vanilla extract to the dry ingredients. Stir until just combined and no dry streaks remain. Be careful not to overmix.
Fold in the chocolate chips.
Serve immediately and enjoy!
Notes
This edible brownie batter is best enjoyed immediately. You can also store it in an airtight container in the refrigerator for up to 3 days.