01 - Combine the milk, heavy cream, brewed coffee, cereal, sugar, vanilla extract, ground cinnamon, and ice cubes in a blender.
02 - Blend on high speed until smooth and frothy, about 1–2 minutes.
03 - Strain the mixture through a fine mesh sieve into a large measuring cup or bowl to remove any cereal pulp if desired, then pour into two tall glasses.
04 - Top with whipped cream, extra cereal, and a sprinkle of cinnamon if desired.
05 - Serve immediately with a straw and enjoy!