Season the cubed chicken with 1 tablespoon of the taco seasoning.
Heat the olive oil in a 12-inch non-stick skillet over medium-high heat. Add the seasoned chicken and cook 2 to 3 minutes per side until lightly browned and cooked through; remove chicken and set aside.
Reduce heat to medium and add the orzo to the skillet. Pour in the chicken broth, enchilada sauce, undrained Rotel, and the remaining taco seasoning; stir to combine.
Bring the mixture to a boil, then cover and simmer for 15 to 20 minutes, stirring once or twice, until the orzo is tender and most of the liquid is absorbed.
Stir in the sour cream, drained corn, drained and rinsed black beans, shredded cheddar, and the cooked chicken. Cook 3 to 5 minutes, stirring, until everything is warmed and the cheese is melted.
Adjust seasoning to taste and serve hot.