In a large pot, bring salted water to a boil. Add the fettuccine and cook according to package instructions until al dente. Drain and set aside.
While the pasta cooks, season the chicken breasts with salt and pepper. Heat olive oil in a large skillet over medium-high heat. Add the chicken and sear for about 5-7 minutes on each side until golden brown and cooked through. Remove from skillet and let rest.
In the same skillet, add minced garlic and sauté for about 30 seconds until fragrant. Add halved cherry tomatoes and cook for another 2-3 minutes until they start to soften.
Pour in the heavy cream and chicken broth, then add the Italian seasoning. Stir to combine and bring the mixture to a gentle simmer.
Add the cooked pasta to the skillet. Stir in the grated Parmesan cheese, allowing it to melt and coat the pasta evenly. Adjust seasoning with salt and pepper to taste.
While the pasta is absorbing the flavors, slice the cooked chicken breasts into strips.
Plate the pasta on serving dishes, topping each portion with sliced chicken. Garnish with fresh basil leaves.