Cook pasta in salted water until al dente. Reserve ½ cup pasta water and drain.
Season chicken with Italian seasoning, salt, and pepper.
Heat olive oil in a large skillet over medium-high heat. Sear chicken until golden and cooked through. Remove and slice.
In the same pan, add garlic and sauté until fragrant. Stir in sun-dried tomatoes and red pepper flakes.
Pour in cream and broth (or pasta water). Simmer gently until slightly thickened.
Remove from heat and stir in Parmesan until smooth.
Add cooked pasta and sliced chicken. Toss until evenly coated.
Garnish with fresh herbs and serve warm.