In a medium bowl, stir together the chicken, soup, sour cream, half of the cheddar, Ro*Tel, cumin, and chili powder.
Crush the Doritos and add half of the to the bottom of a 9x13 baking dish. Top with the chicken mixture. Add the other half of the crushed Doritos over the top of the chicken.
Sprinkle the remaining cheese on top and bake for 20 minutes.
Remove from the oven and top with the pico de gallo.