Cut the chicken into bite-sized pieces, season with salt and pepper, and sauté in olive oil over medium heat for 5-7 minutes until cooked through.
Cook fettuccine according to package instructions, adding broccoli florets during the last 3 minutes of cooking. Drain and set aside.
In the same skillet, sauté minced garlic for 1 minute, then add heavy cream and bring to a simmer. Stir in Parmesan cheese and Italian seasoning until smooth.
Combine cooked chicken, fettuccine, and broccoli with the Alfredo sauce, tossing gently to coat.
Taste and adjust seasoning, then cook for an additional 2-3 minutes over low heat before serving.