Cook the Pasta: 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.
Season and Cook the Chicken: While the pasta cooks, season the chicken breasts with salt, pepper, and Italian seasoning. Heat olive oil in a large skillet over medium heat. Add the chicken and cook for 6-7 minutes per side until golden brown and fully cooked. Remove from the skillet and let rest before slicing.
Sauté Onion and Garlic: In the same skillet, add the diced onion and minced garlic. Sauté for 2-3 minutes until fragrant and softened.
Blend the Sauce: Transfer the sautéed onions and garlic to a blender. Add the roasted red peppers, chicken broth, heavy cream, Parmesan cheese, and paprika. Blend until smooth and creamy.
Simmer the Sauce: Pour the blended sauce back into the skillet and bring to a gentle simmer. Cook for 5-6 minutes, stirring occasionally until the sauce thickens slightly.
Add the Pasta: Add the cooked fettuccine to the sauce, tossing to coat the pasta evenly.
Slice the Chicken: Slice the cooked chicken into thin strips and add it to the pasta, tossing to combine.
Taste and Adjust: Taste the sauce and adjust seasoning if needed. Add more salt, pepper, or Parmesan to balance the flavors.
Garnish and Serve: Garnish with fresh basil or parsley and serve immediately.
Enjoy: Serve hot with extra Parmesan cheese and garlic bread on the side.