"You'll love my twist on this creamy Alfredo. It's a little heavy on the hips, but worth every bite. A perfect match with a nice green salad, and you must have garlic bread to sop up this creamy sauce."
Bring a large pot of lightly salted water to a boil; add 2 tablespoons olive oil. Add trottole and cook at a boil until tender yet firm to the bite, about 8 minutes; drain.
Heat remaining olive oil in a large skillet and add garlic, basil, red pepper flakes, and black pepper. Add chicken; cook and stir until browned, about 10 minutes.
Melt butter over medium heat in the large pot used to make the pasta. Add cream cheese and stir until creamy, about 1 minute. Add 2 cups milk and heavy cream, stirring until warm, about 5 minutes. Add Parmigiano-Reggiano cheese and continue stirring. Add more milk to thin sauce, if needed. Add pesto and sun-dried tomatoes.
Stir cooked chicken and pasta into the sauce. Add shrimp; cook and stir until shrimp turns orange, 6 to 8 minutes more.