Melt milk chocolate. Cool to at least 98°. Whip cream until it holds a soft peak. Add whipped cream to the warm chocolate, a little at a time, stirring with a spoon. When all chocolate is added, stir in salt and vanilla. Chill in refrigerator until mixture is firm but not stiff (5-20 minutes). Beat with a spoon only until fluffy. Do not overbeat.
After the truffle mixture has chilled 5-20 minutes, pack mixture into a pastry bag filled with a coupler without the ring. Pipe a layer of caramel in the chocolate-lined candy mold then pipe a layer of truffle on top. Finish piece by covering truffle mixture with chocolate.
Recipe and image taken with permission from Autumn Carpenter's Book, All About Candy Making. All rights reserved.