Boil salted water and cook fettuccine 10–12 minutes until al dente. Drain and set aside. Toss with a teaspoon of olive oil if prepping early.
Heat olive oil in a skillet over medium-high heat. Season chicken with salt, pepper, and Italian seasoning. Cook 6–8 minutes, turning once, until golden and cooked through. Remove and set aside.
In the same skillet, melt butter over medium heat. Add minced garlic and sauté 30 seconds until fragrant. Return chicken and toss to coat. Turn off heat.
In another skillet, melt butter over medium heat. Sauté garlic 30 seconds. Add heavy cream and chicken broth, simmer gently.
Whisk in Parmesan until smooth. Season with salt and pepper. Cook 3–4 minutes until sauce thickens.
Toss pasta into sauce with tongs. Warm for 2 minutes to absorb flavors.
Plate pasta, top with chicken bites, drizzle with extra garlic butter, and garnish with parsley. Serve immediately.