Break bars into pieces; place in slow cooker.

Add cream, milk, and butter.

Cover; cook on low 45-60 minutes, stirring every 15-20 minutes until chocolate fully melts and mixture is smooth.

Stir in vanilla and salt until combined.

Switch to warm to maintain consistency during party.

Serve with strawberries, banana slices, pound cake cubes, pretzels, marshmallows, or graham crackers for dipping.