Step 1: Cook the Pasta

1. Bring a large pot of salted water to a boil. Add the pasta and cook according to the package instructions until al dente.
2. Reserve 1/2 cup of the pasta water, then drain the pasta and set it aside. Toss with a drizzle of olive oil to prevent sticking.

Step 2: Season and Cook the Proteins

1. In a bowl, toss the shrimp and chicken pieces with 1/2 tablespoon of Cajun seasoning.
2. Heat a large skillet over medium-high heat and add 1 tablespoon of olive oil. Sear the chicken pieces for 4–5 minutes, flipping halfway, until golden brown and cooked through. Remove and set aside.
3. In the same skillet, cook the shrimp for 2–3 minutes per side until pink and opaque. Remove and set aside.
4. Add the sliced andouille sausage to the skillet and cook for 2–3 minutes until browned. Remove and set aside with the other proteins.

Step 3: Sauté the Vegetables

1. Add the remaining tablespoon of olive oil to the skillet, then add the bell peppers and onion. Sauté for 4–5 minutes until softened.
2. Stir in the minced garlic and cook for another minute until fragrant. Remove the vegetables from the skillet and set aside.

Step 4: Make the Cream Sauce

1. In the same skillet, melt the butter over medium heat. Once melted, whisk in the flour to create a roux. Cook for 1–2 minutes, whisking constantly, until the roux is golden and smooth.
2. Gradually pour in the chicken broth, whisking to combine. Then, slowly add the heavy cream, continuing to whisk until the sauce is smooth.
3. Stir in the Parmesan cheese, Cajun seasoning, smoked paprika, and cayenne pepper (if using). Simmer for 2–3 minutes, stirring frequently, until the sauce thickens slightly.

Step 5: Combine and Toss

1. Return the cooked chicken, shrimp, sausage, and sautéed vegetables to the skillet with the sauce. Toss to coat everything evenly.
2. Add the cooked pasta to the skillet and toss again, ensuring the sauce coats the pasta thoroughly. If the sauce is too thick, add a splash of the reserved pasta water to loosen it.

Step 6: Garnish and Serve

1. Transfer the pasta to serving bowls or a large platter.
2. Garnish with chopped parsley, grated Parmesan, and sliced green onions for a vibrant finish.
3. Serve immediately and enjoy!