Seasoning: use a small bowl and mini whisk to combine the garlic powder, onion powder, paprika, dried parsley, salt and pepper.
Chicken: use a knife and chopping board to slice each chicken breast in half lengthways. Then lay the pieces flat on the board and use paper towel to pat each side dry. Next sprinkle the seasoning over one side of the chicken breast, then flip to the other side and season that side also.
Cook chicken: add olive oil to a grill pan. Turn to high heat and use kitchen tongs to place the seasoned chicken into the pan. Work in batches if needed. Grill the chicken for 3 -4 minutes, then use the tongs to flip to the other side. Grill this side for 3 - 4 minutes also, then use kitchen tongs to remove and place on paper towel on chopping board.
Cut chicken: let the chicken rest for 2 to 3 minutes. Then transfer to a chopping board and use a knife to slice into thin pieces.
Alfredo sauce: add the butter to a large pan on high heat. Let this melt and then add the minced garlic and salt. Stir with a wooden spoon and let these cook in the melted butter for 1 to 2 minutes. Then pour in the cream, continuing to stir, reduce the heat to medium and then add the cheese. Stir occasionally till melted and use the spoon to combine.
Fettuccine: read and follow the instructions on the pasta packet to cook the fettuccine. Yet reduce the cook time by a minute to ensure al dente chewy pasta. Moments before draining, use a heatproof jug to scoop out and reserve some (½ cup needed) of the pasta water. Then drain the pasta using a colander and discard the remaining water.
Chicken pieces: use a knife and chopping board to slice the grilled chicken into smaller pieces.
Combine: add the cooked pasta to the alfredo sauce, pour in ½ cup of the reserved pasta water. Then use a wooden spoon to toss and combine, consistently mixing together. Place the cut grilled chicken pieces on top of the alfredo fettuccine.
Garnish: be liberal and generously garnish the dish with parmesan cheese, black pepper and finely chopped parsley. Provide forks and spoons for serving.