Prepare your charcoal until it's ashed over. Move it to one half of the grill so that you have a cooler grill side and a hotter grill side. Make sure the grate is clean.

Snip the silk whiskers sticking out of the top of the corn husk but leave the rest of the corn in a husk. Lay it on the grill, with the bottom of the husk towards the cooler side of the grill. Close the grill and cook for 13-15 minutes, turning it every 3-4 minutes.

Take corn off the grill and carefully, using tongs, take off the husk and the silk. Brush corn with melted butter and place back on the grill. Close the grill and cook, turning it every 3-4 minutes, until lightly charred on all sides.

Take corn off the grill and cut the corn kernel off the cobs. Add corn kernel to the mixing bowl.

Place poblano peppers on the hot side of the grill about halfway through cooking corn. Let them char on both sides.

Once the peppers are nicely charred, take them off the grill. Cut the peppers, take out the seeds, and scrape off the charred skin. Dice the peppers and add them to the mixing bowl.

Add minced cilantro, mayo, sour cream, lime zest, salt, and chili powder to the mixing bowl with corn and peppers. Mix well.

Mix in crumbled queso fresco.

Refrigerate until ready to serve.