In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy.
Mix in the vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. If the dough seems too dry, add milk one tablespoon at a time until the desired consistency is reached.
Fold in the mini chocolate chips until evenly distributed.
Using your hands, scoop out tablespoons of the dough and roll them into small balls (about 1 inch in diameter). Place the truffles on a lined baking sheet.
Once all the dough is rolled out, place the baking sheet in the refrigerator for 30 minutes to firm up the truffles.
Meanwhile, melt the semi-sweet chocolate in a microwave-safe bowl in 30-second increments, stirring in between, until fully melted and smooth.
Remove the truffles from the fridge and dip each ball into the melted chocolate, using a fork to help with the dipping process. Allow any excess chocolate to drip off before placing them back on the lined baking sheet.
If desired, garnish your truffles with sprinkles or crushed nuts before the chocolate sets.
Refrigerate for another 30 minutes until the chocolate coating is firm.