Cook the pappardelle pasta according to package instructions. Drain and set aside.
In a large skillet, heat olive oil over medium heat. Add the diced chicken and cook until browned.
Add the chopped onion and minced garlic to the skillet, cooking until the onion is translucent.
Pour in the chicken broth and bring to a simmer.
Stir in the heavy cream and Parmesan cheese, mixing until well combined.
Add the cooked pappardelle to the skillet, tossing to coat in the sauce.
Season with salt and pepper to taste.
Garnish with fresh parsley before serving.