In a medium bowl, combine the whipped cream cheese, half of the shredded Monterey Jack cheese (1 cup), 1/4 cup of the Cotija cheese and the green chiles. Stir until smooth. Spread the mixture evenly into the bottom of a 6-quart slow cooker.
Melt the butter in a non-stick skillet over medium-high heat. Pour in the bag of frozen corn and add the cumin and Tajín. Stir to combine. Cook, stirring very occasionally, for 5 - 6 minutes, to lightly char the corn. Remove the pan from the heat and stir in the mayonnaise.
Spread the cooked corn mixture over the top of the cream cheese mixture. Top with the remaining shredded Monterey Jack cheese (1 cup).
Cover and cook on HIGH for 1 hour or on LOW for 2 hours. Turn the slow cooker to the warm setting for serving.
Garnish with the remaining 2 tablespoons of Cotija cheese, the lime zest and the chopped cilantro. Serve with tortilla chips.
Notes
Cook on HIGH for 1 hour or on LOW for 2 hours, then turn to the warm setting for serving.