Boil 1 cup water and cinnamon stick for 5 minutes.
Meanwhile, shave down the sides of the corn and remove the kernels.
Repeat with remaining corn ears.
Reserve ½ cup of kernels.
Add corn kernels to a blender along with 1 cup of water.
Blend until smooth.
Strain the mixture into the stock pot with the cinnamon.
Add the sugar and reserved corn kernels.
Dissolve the cornstarch with 2 tablespoon water.
Add the milk and the cornstarch mixture.
Reduce heat to medium-low.
Cook for 20 minutes, stirring constantly.
You don't want it to stick to the bottom.
Pour into cups.
Dust with ground cinnamon (optional) and enjoy!