Preheat the oven to 350ºF.

Lay the ears of corn directly on the oven rack and roast for 30 minutes or until the corn is soft.

Combine the butter with the chili powder in a small bowl.

Finely grate the zest of the lime into the mixture.

Then add the juice of the lime and stir to combine.

When the corn is done roasting, peel back the husks and pull off the corn silk.

Brush with the butter mixture and serve.

Serve any additional butter mixture on the side.