Put chocolate in a medium heatproof bowl; set aside.
Heat cream in a small saucepan over medium just to a simmer without boiling.
Pour hot cream over chocolate; stand 2 minutes, then stir gently until smooth and glossy.
Stir in butter, vanilla, and salt until combined and silky.
Cover with plastic wrap; refrigerate 2-3 hours until scoopable.
Use a small cookie scoop or melon baller to portion, then quickly hand-roll into 1-inch balls before they get messy.
Roll in cocoa or chosen coating to cover completely.
Store airtight in refrigerator up to 2 weeks or freeze up to 3 months.