01 - Combine milk, heavy cream, brewed coffee, cereal, sugar, vanilla extract, ground cinnamon, and ice cubes in a blender container.
02 - Blend on high speed until completely smooth and frothy, approximately 1-2 minutes. Ensure all cereal pieces are fully incorporated.
03 - Pour mixture through a fine mesh sieve into a large measuring cup to remove cereal pulp for a smoother texture. This step is optional but recommended.
04 - Pour strained frappe into two tall glasses. Top with whipped cream, sprinkle extra cereal pieces, and dust with ground cinnamon.
05 - Serve immediately with straws while cold and frothy. For best results, consume within 10 minutes of preparation.