Start by combining the first eleven ingredients in a heavy-duty ziplock bag. This includes the garlic powder, onion powder, dried thyme, dried oregano, paprika, dried tarragon, salt, ground red pepper, black pepper, olive oil, and Worcestershire sauce. This mixture will serve as your marinade, infusing the chicken with incredible flavor.
Add the chicken breasts to the bag, seal it tightly, and ensure the marinade evenly coats the chicken. Marinate in the refrigerator for at least eight hours, flipping the bag occasionally to ensure even flavoring. When it's time to cook, remove the chicken from the bag and discard the marinade.
Heat a skillet over medium-high heat. Once hot, place the chicken in the skillet and cook for about five minutes on each side or until it's beautifully browned and cooked through. You should look for a nice char on the outside, which will add a lovely flavor.
Once cooked, transfer the chicken to a cutting board and slice it diagonally. Set it aside for later.
Cook the fettuccine according to the package directions, ensuring it reaches al dente perfection. Drain the pasta but reserve a bit of the cooking water to help loosen the sauce if needed.
In the same skillet you used for the chicken, warm up the Alfredo sauce over medium heat. Stir it occasionally to prevent sticking and ensure it heats evenly.
Once the sauce is warmed through, add the drained fettuccine to the skillet. Toss the pasta in the sauce, making sure every strand is coated. If it seems a bit thick, add a splash of the reserved pasta water to loosen it up.
Next, stir in the chopped Roma tomato and green onions into the pasta mixture. This will add freshness and a nice crunch, balancing the creaminess of the sauce.
To serve, place a generous portion of the creamy fettuccine in a bowl or on a plate. Top it with the sliced chicken, allowing the sauce to be seen underneath.
Garnish with additional green onions or even some grated cheese if desired, and enjoy your stunning meal! This combination of flavors is sure to impress anyone who tries it.
