Sprinkle the chicken pieces evenly with the taco seasoning.
Heat the oil in a large 12-inch non-stick skillet over medium-high heat.
Add the seasoned chicken and cook, stirring occasionally, until browned and no longer pink inside; remove the chicken from the skillet and set aside.
To the same skillet, add the instant rice, milk, and thin salsa; bring to a boil.
Cover the pan, reduce heat to low, and simmer for 5 to 7 minutes, or until the instant rice is tender and has absorbed most of the liquid.
Stir in the queso cheese dip and the undrained Rotel tomatoes; simmer uncovered for about 5 minutes to heat through and meld flavors.
Spoon one-quarter cup of the shredded Mexican cheese over the rice mixture, arrange the cooked chicken on top, then sprinkle with the remaining cheese.
Cover the skillet and cook just until the cheese melts, about 1 to 2 minutes; serve warm.