Place chocolate in a 2 cup measure.
Micro cook, uncovered, on 100% power for 1½ to 2 minutes or until melted, stirring once.
Stir in corn syrup and sweetened condensed milk.
Micro cook, uncovered, on 100% power for 30 to 45 seconds or until heated through.
Stir in vanilla.
Serve warm a top ice cream.
Sprinkle with peanuts.
Arrange banana around ice cream.