01 - Place the milk, ice cubes, vanilla ice cream, vanilla bean seeds or extract, and sugar into the blender container.
02 - Blend on high speed until completely smooth and creamy, about 30-60 seconds.
03 - Taste the mixture and add additional sugar if desired. Blend for another 10-15 seconds to incorporate.
04 - Divide the frappuccino evenly between two tall glasses. Top with whipped cream if using and serve immediately.