Heat-treat your flour so it is safe to use: Place flour in a microwave-safe dish and cook for 1 minute and 15 seconds, stirring it every 15 seconds. Set aside.

Beat sugar and butter with an electric mixer in a large bowl until creamy

Beat in vanilla extract and salt. Add heat-treated flour; mix until a crumbly dough forms

Stir in milk until dough is just combined; fold in dark chocolate chips

Press into a baking dish or pan.

In a double boiler, melt 1 cup dark chocolate chips.

Pour over cookie dough and freeze.

When firm, cut and serve.