Heat cream just to a simmer, pour over the semi sweet chocolate. Let it sit 1 minute then stir until smooth. Let the glaze stand at room temperature until it becomes slightly thickened,nabput 15 to 20 minutes. It should be just porarable. Ladle over top of cake allowing it to drip down sides of cake. Garnish with the sprinkles while the glaze is wet, so they stick. Let chocolate set. Serve with whipped cream