Whisk malted milk powder and powdered sugar together to remove clumps.
Add softened butter, vanilla, and 2 tablespoons milk. Mix until a soft dough forms; add tiny splashes of milk only if needed.
Roll small pieces into marble-sized balls. If sticky, chill 10–15 minutes.
Freeze rolled balls for 20–25 minutes to help them hold shape.
Melt chocolate chips and coconut oil in 20-second intervals, stirring until smooth.
Dip a few frozen balls at a time into melted chocolate, roll to coat, and lift with a fork. Tap off excess chocolate.
Place coated balls on parchment and chill 10–15 minutes until the chocolate hardens.