Heat-treat the flour in the microwave for about 1 minute to make it safe for edible dough.
Beat softened butter, brown sugar, and granulated sugar until creamy.
Mix in vanilla extract and milk until smooth.
Add the heat-treated flour and mix until a soft cookie dough forms.
Fold in mini chocolate chips.
Scoop small pieces of dough and flatten them in your hand.
Add a small spoonful of Nutella in the center.
Wrap the cookie dough around the Nutella and roll into a smooth ball.
Place the truffles on a parchment-lined tray.
Chill in the freezer for about 20 minutes until firm.
Dip each truffle into melted chocolate and coat completely.
Let the chocolate set before serving.