01 - Heat vegetable oil in a large Dutch oven or heavy-bottomed pot over medium-high heat until shimmering.
02 - Add sliced andouille sausage to the hot oil. Cook for approximately 3 minutes until lightly browned. Remove sausage with a slotted spoon and set aside on a plate.
03 - Place chicken pieces in the pot and cook for 4–5 minutes, turning occasionally, until browned on all sides. Remove chicken and add to the plate with sausage.
04 - Reduce heat to medium. Add diced onion, green bell pepper, and celery to the pot. Sauté for 5 minutes, stirring occasionally, until vegetables begin to soften and onion becomes translucent.
05 - Stir in minced garlic and cook for 1 minute until fragrant, being careful not to burn.
06 - Add diced tomatoes with juice, rinsed rice, Cajun seasoning, smoked paprika, thyme, oregano, cayenne pepper, bay leaf, salt, and black pepper. Stir thoroughly to coat all ingredients and distribute spices evenly.
07 - Return browned sausage and chicken to the pot. Pour in chicken broth and bring mixture to a rolling boil, stirring occasionally.
08 - Reduce heat to low, cover tightly, and simmer for 20 minutes. Stir once or twice during cooking to prevent rice from sticking to the bottom.
09 - Gently fold in shrimp, stirring carefully to avoid breaking them. Cover and continue cooking for 5–7 minutes until shrimp turn pink and opaque, and rice is tender.
10 - Remove and discard the bay leaf. Taste jambalaya and adjust salt, pepper, or cayenne as needed.
11 - Sprinkle generously with sliced scallions and chopped fresh parsley. Serve immediately while hot, offering lemon wedges on the side for squeezing over individual portions.