Begin by carefully heat-treating your flour in the oven at 350°F for 5 minutes. This process ensures the flour is safe to eat raw. Once done, allow it to cool completely.

In a mixing bowl, beat together the softened unsalted butter, brown sugar, and granulated sugar until the mixture is smooth and creamy.

Add the cocoa powder, salt, vanilla extract, and 4 tablespoons of milk to the buttery mixture. Stir until everything is well combined.

Gently fold in the heat-treated flour and chocolate chips, taking care not to overmix.

Check the batter's consistency; it should be thick yet spreadable. If it's too thick, feel free to add a splash of milk until you reach your desired texture.