1. Bring a large pot of salted water to a boil. Add the fettuccine and cook according to package instructions until al dente. Drain and set aside.
2. In a large skillet, heat the olive oil over medium heat. Add the sliced sausage and cook until browned, about 5 minutes. Remove the sausage from the skillet and set aside.
3. In the same skillet, add the bell peppers and garlic. Sauté until the peppers are tender and the garlic is fragrant, about 3 minutes.
4. Reduce the heat to low and pour in the heavy cream. Stir in the Parmesan cheese and Cajun seasoning, whisking until the cheese has melted and the sauce is smooth.
5. Add the cooked sausage back to the skillet, then toss in the cooked fettuccine. Stir until the pasta is well coated in the sauce.
6. Season with salt and pepper to taste. Garnish with fresh parsley just before serving.

Cooking is all about intuition. Trust your senses—smell, taste, and even sound—to guide you through these steps. My grandmother always said that a good cook listens with their heart as much as with their ears.