Microwave the flour in 30-second bursts, stirring, until it reaches 165°F. Let it cool completely.
Beat the softened butter, brown sugar, and granulated sugar until light and creamy.
Mix in the vanilla, salt, and about half the milk until smooth.
Blend in the cooled flour just until no dry spots remain.
Splash in more milk a little at a time until the dough is soft and scoopable.
Fold in the mini chocolate chips until evenly distributed.
Scoop and roll into 1-inch balls. Chill 15–20 minutes to set before serving.