Preheat an outdoor grill or indoor grill pan to medium-high heat.
Pulse the garlic in a food processor until very finely minced. Add the mustard, 1/2 teaspoon salt, 1/2 teaspoon pepper and 1/2 cup Parmesan and pulse until everything is well combined. Pour the olive oil slowly into the mixture while pulsing. Take 1/4 cup of the mixture and brush it over the ears of corn so that they are completely coated, then set aside the remaining mixture. Mix the remaining 1/2 cup Parmesan with the parsley in a small bowl and set aside.
Add the corn to the grill and cook, turning halfway through, until the corn is charred and browned in spots, about 15 minutes. Remove the corn to a platter and brush it with the remaining garlic mixture, then sprinkle the corn with the parsley and cheese mixture. Serve immediately.
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