Heat-treat the all-purpose flour to ensure safety by baking it at 350°F for 5-7 minutes or microwaving it in intervals until it reaches 160°F. Allow to cool.

In a large mixing bowl, cream together unsalted butter, brown sugar, and granulated sugar using an electric mixer until light and fluffy.

Add vanilla extract and milk to the creamed mixture and mix until well combined.

Gradually stir in the heat-treated flour, then fold in chocolate chips.

Line an 8x8-inch baking dish with parchment paper, pour the mixture in, and press it down firmly.

Chill in the refrigerator for at least 1-2 hours to set.

Once set, slice into bars and serve cold or at room temperature.