01 - Combine 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, approximately 1–2 minutes.
03 - Strain mixture through a fine mesh sieve into a large measuring cup to remove cereal pulp if desired, then pour into two tall glasses.
04 - Top with whipped cream, extra cereal, and sprinkle with cinnamon if desired.
05 - Serve immediately with straws and enjoy.