Preheat the grill to medium-high heat. If you don’t have a grill, a grill pan or even your oven broiler will work in a pinch.
Brush the corn with olive oil. Don’t drown it—just a light coat so it doesn’t stick.
Grill the corn, turning occasionally, until it’s charred in spots and tender (about 8–10 minutes).
In a small bowl, mix the Greek yogurt, garlic, lime juice, and chili powder. Taste and adjust—more lime if you want more tang, more chili powder if you want to show off to your spice-loving friends.
Slather the hot corn with the yogurt mixture. Be generous—it’s the whole point!
Sprinkle with cotija or parmisan cheese and cilantro/parsley, then serve with extra lime wedges because dramatic lime squeezing at the table is a power move.