In a 2-1/2-qt. microwave-safe bowl, combine the sugar, cocoa, flour and salt. Gradually whisk in milk and cream until smooth. Cover with waxed paper. Microwave on high for 8-9 minutes or until thickened, whisking every 4 minutes. Whisk in the vanilla.
Pour into dessert dishes. Serve warm, or press a piece of waxed paper or plastic wrap on top of pudding and refrigerate.