In a large pot, heat the olive oil over medium heat. Add the diced chicken breasts and season with salt and pepper. Cook until the chicken is browned and cooked through, approximately 5-7 minutes. Remove the chicken from the pot and set aside.
In the same pot, add the minced garlic and sauté for about 30 seconds until fragrant.
Pour in the chicken broth and bring to a simmer. Add the fettuccine pasta and cook according to package instructions until al dente, stirring occasionally.
Once the pasta is cooked, reduce the heat to low and stir in the heavy cream and grated Parmesan cheese. Mix until the sauce is creamy and well combined.
Add the cooked chicken back into the pot along with the fresh spinach and Italian seasoning. Stir until the spinach wilts and everything is heated through, about 2-3 minutes.
Taste and adjust the seasoning with more salt and pepper if needed.
Notes
Serve in bowls topped with additional Parmesan cheese and chopped parsley.