Cook the chopped bacon in a large skillet over medium heat until crispy. Transfer to a paper-towel-lined plate and pour off all but about 1 tablespoon of the bacon fat.
Add the corn and diced jalapeños to the skillet with the reserved bacon fat. Cook over medium-high heat for 4 to 5 minutes, until the corn is lightly charred. Remove from heat and let cool slightly.
Preheat the oven to 375°F. In a large bowl, beat together the cream cheese, sour cream, and mayonnaise until smooth.
Stir in the cheddar, cotija, garlic, chili powder, Tajín, lime juice, and cilantro. Fold in the charred corn, jalapeños, and most of the bacon (reserve some for topping). Season with salt and pepper to taste.
Spread the mixture into a greased baking dish or cast-iron skillet. Top with the reserved bacon and extra cotija.
Bake for 20 to 25 minutes, until hot, bubbly, and golden around the edges.
Garnish with a dusting of Tajín, chopped cilantro, and jalapeño slices. Serve warm with tortilla chips.