Start by boiling a big pot of water and adding the fettuccine. Cook until it is al dente and slightly firm to the bite. This will allow the noodles to soak up sauce later. Be careful not to let the pasta get mushy.
While the pasta is cooking, take the chicken breasts, season them with Italian seasoning, salt, and pepper. Ensure a good coating for flavor but be mindful not to over-salt.
Heat olive oil and butter in a skillet over medium heat. Once hot, add the chicken and listen for that sizzle. Cook until the chicken is golden brown and cooked through, around 6 to 7 minutes on each side. An instant-read thermometer should read 165 degrees F when done.
In the same skillet, add butter, minced garlic, and seasonings after taking the chicken out. You should smell the garlic quickly becoming fragrant. Avoid burning the garlic to prevent bitterness.
Pour in the heavy cream and bring it to a gentle simmer. You will notice it thicken a bit. As it simmers, whisk in the grated Parmesan until fully melted and incorporated. If the sauce appears too thin, give it another minute on the heat.
Once the fettuccine is ready, drain it and add straight into the sauce. Stir thoroughly until the pasta is well-coated and the cheese clings to every strand.
After cooking, slice the chicken into pieces. Arrange it nicely on top of the pasta for serving, preserving its juicy tenderness.
Dish out the pasta and chicken, optionally finishing with a sprinkle of extra cheese and Italian seasoning. Enjoy the aroma as you serve.