Season the chicken with salt and black pepper.
Heat olive oil in a skillet over medium heat.
Cook chicken until golden and cooked through, about 5 minutes on each side.
Remove and set aside.
In the same skillet, add butter and minced garlic.
Cook until fragrant, about 30 seconds.
Add the heavy cream and bring to a simmer.
Stir occasionally.
Gradually whisk in the Parmesan cheese until the sauce is smooth.
Adjust seasoning with salt and pepper.
Meanwhile, cook fettuccine in boiling salted water until al dente.
Drain the pasta and add it to the Alfredo sauce.
Toss well.
Slice the chicken and serve on top of the fettuccine
Garnish with chopped parsley.