Heat-treat the flour

• Spread the flour on a baking tray and bake until it reaches 75 °C to make it safe to eat raw.
• Let the flour cool completely before using.

Make the cookie dough

• Beat the softened butter with the brown sugar and granulated sugar until creamy.
• Stir in the vanilla extract and milk.
• Add the cooled flour and salt and mix into a soft dough.
• Fold in the chocolate chips.

Shape and chill

• Press the dough evenly into a lined baking dish.
• Chill until firm, then cut into bars.