Cook the pasta: Begin by cooking the pasta according to the packet instructions. Once cooked, drain and set aside.
Season the chicken: While the pasta is cooking, season the diced chicken breasts with the Cajun seasoning, smoked paprika, and a pinch of salt and pepper. Ensure the chicken is well-coated with the spices.
Sear the chicken: Heat a large pan over medium heat and spritz with cooking spray. Add the seasoned chicken and cook for 5-7 minutes, stirring occasionally, until the chicken is browned and cooked through. Remove the chicken from the pan and set it aside.
Cook the vegetables: In the same pan, add the sliced red pepper and spring onion. Cook for 3-4 minutes until they start to soften. Add the garlic and cook for another minute, being careful not to burn it.
Make the sauce: Lower the heat and stir in chicken stock. Allow the mixture to simmer for a couple of minutes, then stir in the low-fat crème fraîche. Let the sauce bubble gently until it thickens slightly.
Combine everything: Return the cooked chicken to the pan, along with the drained pasta. Toss everything together until the pasta is well coated in the creamy Cajun sauce. If the sauce is too thick, add a splash of water or more chicken stock to reach your desired consistency.
Season and serve: Taste the pasta and adjust the seasoning if needed.