Toss chicken strips with 1 tablespoon Cajun seasoning until evenly coated.

Bring a large pot of salted water to a boil and cook fettuccine according to package directions until al dente. Drain and set aside.

Heat olive oil in a large skillet over medium-high heat. Add seasoned chicken and cook 5-7 minutes until golden brown and cooked through. Remove to a plate.

In the same skillet, add bell peppers and onion. Cook for 3-4 minutes until softened. Add garlic and cook 30 seconds more until fragrant.

Reduce heat to medium. Add heavy cream, chicken broth, and remaining Cajun seasoning. Bring to a simmer and cook 3-5 minutes until slightly thickened.

Stir in Parmesan cheese until melted. Return chicken to skillet and add drained pasta, tossing to coat everything in the sauce. Season with salt and pepper to taste.

Garnish with sliced green onions and chopped parsley before serving hot.