01 - Combine milk, heavy cream, sugar, and vanilla bean seeds or vanilla extract in a blender container.
02 - Add ice cubes and blend on high speed until completely smooth and frothy, approximately 45-60 seconds.
03 - Taste the blended mixture and adjust sweetness or vanilla intensity as desired. Blend briefly to incorporate any additions.
04 - Pour the frappuccino evenly into two tall glasses. Top with whipped cream and white chocolate shavings if using. Serve immediately while frosty.