In a medium bowl, stir together the cream cheese, mayonnaise, and sour cream until smooth. Gently stir in the crabmeat, scallions, chiles, lime zest, 2 teaspoons salt, and 1 teaspoon black pepper and set aside.
Distribute half of the corn chips on a large (12 × 18 × 2-inch) ovenproof serving platter (or a sheet pan). Spoon half of the crab mixture over the chips in dollops and then sprinkle with half of the Cheddar, half of the Monterey Jack, and all of the pickled jalapeños. Sprinkle with the remaining chips, then distribute the remaining crab mixture and cheeses on top. Bake for 20 to 30 minutes, until the cheese is melted and bubbling.
Meanwhile, prepare the topping. In a large bowl, combine the tomatoes, onion, jalapeño pepper, lime juice, olive oil, avocado, parsley, and 1 teaspoon salt. Spoon onto the nachos, sprinkle with lime juice, and serve hot.
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This recipe has been updated and may differ from what was originally published or broadcast.