Heat-treat the flour by spreading it on a baking sheet and baking briefly, then allow it to cool completely.

In a bowl, whisk together the cooled flour, cocoa powder, and salt.

In another bowl, cream the softened butter with brown sugar and granulated sugar until smooth.

Add milk and vanilla extract, mixing until fully combined.

Gradually stir the dry ingredients into the wet mixture until thick and glossy.

Fold in the mini chocolate chips.

Adjust consistency with additional milk if needed.

Serve immediately or chill before serving.