Boil a large pot of salted water.
Cook the fettuccine until al dente, then drain and set aside.
Combine white pepper, cayenne pepper, paprika, garlic powder, and onion powder in a small bowl to make the Cajun seasoning.
Heat olive oil in a large skillet over medium heat.
Add chicken strips and cook until browned.
Add sausage and shrimp, and stir until shrimp becomes pink.
Add the red bell pepper and minced garlic to the skillet.
Cook the vegetables until they become tender.
Pour in chicken stock and bring the mixture to a simmer.
Stir in the cooked fettuccine, and let everything heat through for a few minutes.