In a large pot of salted boiling water, cook the fettuccine according to package instructions until al dente. Drain and set aside.
While the pasta cooks, season both sides of the chicken breasts with Cajun seasoning, salt, and pepper.
Heat the olive oil in a large skillet over medium-high heat. Add the chicken breasts and cook for about 5-7 minutes per side, or until cooked through and golden brown. Remove the chicken from the skillet and let rest.
In the same skillet, add diced onion and sauté for 2-3 minutes until translucent. Add minced garlic and bell peppers, cooking for an additional 3-4 minutes until the peppers are tender.
Pour in the chicken broth and heavy cream, stirring to combine. Bring to a gentle simmer, allowing the sauce to thicken for about 3-5 minutes.
Slice the grilled chicken into strips and return it to the skillet along with the cooked fettuccine and halved cherry tomatoes. Toss everything together until well coated with the creamy sauce.
Stir in the grated Parmesan cheese until melted and well incorporated, adjusting seasoning with salt and pepper as needed.
Plate generously and garnish with chopped parsley for a vibrant touch.
Notes
Serve in deep bowls, topped with additional Parmesan and a drizzle of olive oil.