Season chicken, if desired, with salt and ground black pepper.
Heat Olive Oil in 12-inch skillet over medium-high heat and cook chicken, stirring occasionally, until chicken is thoroughly cooked. Remove chicken and set aside.
Add onion to same skillet and cook, stirring occasionally, 4 minutes or until golden. Add garlic and cook 30 seconds. Stir in Sauce and broth. Reduce heat to low and simmer covered 5 minutes. Stir in basil. To serve, toss hot fettuccine with sauce in large bowl, then top with chicken.