.  If necessary to prevent over browning, cover rolls loosely with foil the last 5to 10 minutes of baking.  Remove rolls from oven.  Brush again with half and half.  Cool slightly and drizzle with Powdered sugar glaze and serve warm.   Powdered sugar glaze:  In a bowl, stir together 1 1/4 cup powdered sugar, 1 tablespoon corn syrup, 1/2 teaspoon vanilla, and enough half and half (1 to 2 tablespoon) to make of drizzling consistency.