Add corn cobs to pan and cook, turning often, until kernels begin to blacken.
While corn is cooking, add mayonnaise to a small bowl.
Cut lime in half. Slice one-half into 4 wedges and set aside.
Juice other lime half and add to mayonnaise. Stir well.
When corn is finished cooking, place it on a platter and coat generously with lime-mayo mixture.
Sprinkle cobs lightly with salt. Then cover cobs with chili powder and cayenne to taste. Sprinkle with Cotija cheese.
Serve with lime wedges. Enjoy!
Notes
If you cannot find Cotija cheese, you can substitute Queso Fresco, Parmesan, or a mild feta. Corn can also be cooked over a medium hot grill, if you have one. Prepare as you would on the stove, turning frequently, and cooking until kernels begin to blacken.