In a bowl, toss the diced chicken with Cajun seasoning until well coated.
In a large skillet, heat olive oil over medium-high heat. Add the seasoned chicken and sauté until browned and cooked through, about 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add chopped onion and bell pepper. Sauté for 3-4 minutes, until softened. Add minced garlic and cook for an additional minute, until fragrant.
Stir in the orzo pasta and toast for 2 minutes, stirring frequently until slightly golden.
Pour in the chicken broth and diced tomatoes (with juice), bring the mixture to a boil, then reduce to a simmer.
Return the chicken to the skillet and stir in frozen peas and paprika. Cover and cook for 12-15 minutes, or until the orzo is al dente and the liquid is mostly absorbed. Stir occasionally and add more chicken broth if necessary.
Season with salt and pepper to taste. Remove from heat.
Garnish with freshly chopped parsley before serving.
Notes
Add more chicken broth if the orzo absorbs too much liquid.