Grill corn for 6-8 minutes or until it has a nice char on the outside. Let cool then trim the corn off the cobs.
While corn is cooking and/or cooling, prepare your produce. Dice your red onion, cilantro, and optional jalapeños.
In a mixing bowl, combine fresh cilantro, grated parmesan, feta crumbles, red onion, mayo and seasonings. Toss in the cooled corn, sriracha, and optional jalapeños.
Garnish with an additional 2 tablespoons of chopped cilantro before serving. Serve with a family size bag of chips, fresh vegetables, on top of tacos...so many options!