Spread the flour on a baking sheet lined with parchment paper. Bake for 10 minutes at 180°C (350°F), stirring halfway through, to heat-treat it. Let the flour cool down completely.
In a mixing bowl, combine the softened butter and brown sugar until the mixture is very creamy.
Add the completely cooled heat-treated flour to the butter mixture and mix well.
Pour in a little cold milk and mix. Adjust the amount of milk until you reach your desired cookie dough consistency.
Chop the half chocolate bar into chunks on a cutting board.
Fold the chocolate chunks into the dough. Roll into balls or eat immediately with a spoon!
Cook it hands-free.
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