In a large bowl, combine the chicken, 1 tablespoon Cajun seasoning, egg, breadcrumbs, and Parmesan.
Mix until very well combined, then form 1-inch meatballs.
Heat the oil in a deep, oven-safe skillet over medium heat.
Sear the meatballs until browned on all sides, about 5 minutes. The meatballs will not be cooked all the way through.
Remove from the heat and add the peppers, onions, garlic, diced tomatoes, tomato sauce, broth, remaining tablespoon Cajun seasoning, and orzo to the pan.
Stir to disperse the ingredients evenly, submerging the orzo in liquid.
Bake for 30 minutes, or until the orzo is fluffy and al dente. Most of liquid should be absorbed.