Cook the pasta according to package instructions; drain and set aside.
In a large skillet, heat olive oil over medium heat.
Add the chopped onion and garlic, sautéing until fragrant.
Add the sliced chicken and cook until browned on all sides.
Stir in the sliced bell pepper and cook until slightly tender.
Pour in the heavy cream and stir to combine.
Mix in the grated Parmesan cheese until melted.
Season with salt and pepper to taste.
Add the cooked pasta to the skillet, tossing to coat.
Garnish with fresh parsley before serving.