Fill a large pot with lightly salted water and bring to a rolling boil. Cook fettuccine at a boil until tender yet firm to the bite, about 8 minutes; drain and keep warm.
STEP 2
Meanwhile, season chicken with 1/2 teaspoon salt and 1/2 teaspoon pepper.
STEP 3
Heat oil in a large skillet. Add chicken to skillet, cook and stir for 3 minutes. Add sun-dried tomatoes and garlic, and cook until fragrant, about 1 more minute. Add cream, mozzarella cheese, Parmesan cheese, and 2 tablespoons basil. Cook on low, stirring constantly, until cheese is melted.
STEP 4
Stir red pepper flakes and fettuccine into sauce. Season with remaining salt and pepper. Top with remaining basil.