In a large skillet, heat the olive oil over medium heat. Add the diced onion and bell pepper, sautéing until softened, about 5 minutes.
Stir in the minced garlic and cook for an additional minute until fragrant.
Add the chicken pieces to the skillet. Sprinkle with Cajun seasoning, salt, and pepper. Cook until the chicken is browned, about 7-8 minutes.
Once the chicken is cooked through, add the cherry tomatoes and sauté for another 2 minutes.
Pour in the chicken broth and bring the mixture to a boil.
Stir in the orzo and reduce the heat to a simmer. Cover and cook for about 10-12 minutes, stirring occasionally, until the orzo is tender and has absorbed most of the liquid.
Remove from heat and let it sit, covered, for an extra 2-3 minutes to allow the flavors to meld.
Fluff with a fork and adjust seasoning if needed. Garnish with fresh parsley before serving.