Dice the onion and bell pepper, then cut the sausage and chicken separately into bite-sized pieces. Set aside.
Add just the chicken and Cajun seasoning to a bowl and toss to coat. Set aside.
Add the cut-up sausage to a large pot, Dutch oven or extra-large skillet and cook over medium heat for 5-7 minutes, stirring often, to just lightly brown. Remove sausage from pot and set aside.
Add the seasoned chicken to the pot and cook for about 8 minutes over medium heat, stirring often, until fully cooked. Remove from the pot.
Add the diced onion and bell pepper and cook for about 5 minutes, until lightly browned. Then add the garlic and cook for 2 minutes.
Add the meat back to the pot and give it a quick stir.
Pour in the broth and turn the burner to high to bring it to a boil. Use a spatula or wood spoon to scrape up the fond from the bottom. Stir.
Stir in the dry rice, reduce the heat to low, cover, and simmer for 10 minutes. Stir, then simmer for an additional 10 minutes. Try not to lift the lid except for the once.
Taste-test the rice to make sure it's not chewy. Let it sit with the lid on undisturbed an additional 6 minutes.
Stir, then top with the diced green onions before serving.