Start by cutting the corn from the cob. See the notes for an easy way to do this using a Bundt pan!
Boil the corn in salted cooking water over medium high heat for about 10 minutes.
Drain and return to the pot. Scoop out 2 cups of corn and add to a blender with the buttermilk.
Blend until smooth.
Pour back with the whole corn. Add the butter, salt and onion powder. Warm over low heat for about 5 minutes.
Taste for additional seasoning and serve!
Notes
How to easily remove corn from the cob:Grab a Bundt pan. Place the corn cob in the center hole and run a sharp knife down the sides of the corn, removing the kernels.