Top with powdered sugar OR a simple chocolate ganache: Add ⅔ cup semisweet chocolate chips to a microwave safe bowl and heat 1 minute to soften the chocolate; set aside. Heat ¼ cup cream in a glass measuring cup until very hot, but not boiling. Pour the cream over the chocolate and let stand for 1 minute. Whisk together until the chocolate is completely melted and the mixture is very smooth. Pour over the cake or let stand until slightly thickened and pour over later.