Combine first 5 ingredients in large bowl and beat 1 minute.
Add remaining ingredients and mix thoroughly .
Pour batter into 12 3/4 cup glass custard cups, filling 2/3 full.
Arrange 6 cups in circle on microwave-safe round platter .
Cook on High 4 1/2 minutes, turning platter if muffins appear to be cooking unevenly.
Repeat with remaining batter .
Loosen muffins from cups with thin knife and turn out onto racks.