Preheat the oven to 350°F (175°C) and spray a 9x13-inch casserole dish with cooking spray.
In a large bowl, combine the shredded chicken, kosher salt, black pepper, onion powder, garlic powder, Rotel (tomatoes and green chiles), softened cream cheese, cream of chicken soup, drained black beans, drained corn, 1/2 of the shredded cheese, cumin, smoked paprika, and sour cream; stir until evenly mixed.
Spread a layer of Doritos on the bottom of the prepared casserole dish to lightly cover the surface.
Spread the chicken mixture evenly over the Doritos layer, breaking chips as needed so the mixture covers them.
Top the chicken mixture with more Doritos to cover, then sprinkle the remaining shredded cheese over the top (or place cheese down and chips on top if you prefer crispier chips).
Bake in the preheated oven for 20–25 minutes, until the casserole is bubbly and the cheese is melted and lightly browned.
Remove from the oven and top with pico de gallo before serving.