01 - Pour milk, heavy cream, sugar, and scraped vanilla bean seeds into blender canister. Mix until sugar begins to dissolve.
02 - Add ice cubes to blender. Process on high speed for 45-60 seconds until mixture becomes smooth, thick, and frothy with no visible ice chunks.
03 - Stop blender and taste mixture. Add additional sugar or vanilla extract if needed, then pulse briefly to incorporate.
04 - Divide blended frappuccino evenly between two 16-ounce tall glasses, pouring carefully to maintain frothy texture.
05 - Top each serving with generous dollop of whipped cream and sprinkle with white chocolate shavings. Serve immediately while frosty.