1. Combine the corn, onion, lime juice, and jalapeño in a small bowl. Season with salt and pepper.
Spread the tortilla chips on a foil-lined baking sheet. Top with cheddar. Bake in a 400° F oven until the cheese melts, 5 to 6 min.
To serve, top nachos with the corn salsa, cilantro, sour cream, and avocado.