Combine cream cheese, butter, yogurt, marjoram, paprika, mustard, TABASCO® Sauce, salt, capers, and chives in a blender or food processor; process 1 minute. Pour into a serving bowl and refrigerate until ready to serve.
Wash radicchio and dry well. Trim off bottom 2 inches. When ready to serve, place radicchio in cheese. Serve cold as spread with bagel thins.
Makes 2 cups.