01 - In a large mixing bowl, cream together softened butter, packed light brown sugar, granulated sugar, and salt until the mixture is light and fluffy, approximately 2-3 minutes.
02 - Add whole milk and pure vanilla extract to the creamed mixture. Mix until fully combined.
03 - Gradually stir in the heat-treated all-purpose flour until completely incorporated into the dough.
04 - Gently fold mini chocolate chips into the dough using a spatula or wooden spoon until evenly distributed.
05 - Using a tablespoon measure, scoop portions of dough and roll each into a tight ball. Arrange on a parchment-lined baking sheet.
06 - Place the baking sheet in the freezer for 20-30 minutes until the dough balls are completely firm.
07 - Place chopped chocolate and coconut oil if using in a microwave-safe bowl. Melt in 20-second intervals, stirring between bursts until smooth and glossy.
08 - Using a fork, dip each chilled dough ball into the melted chocolate, allowing excess to drip off. Return the coated truffle to the baking sheet.
09 - Transfer the baking sheet to the refrigerator and chill for 15 minutes until the chocolate coating is completely set.
10 - Transfer cooled truffles to an airtight container and refrigerate for up to one week before serving.