In a large pot, boil water and cook pasta.
While that's cooking, make your chicken and sauce. Sprinkle both sides of the lightly pounded chicken breasts with salt and pepper. Add 1 tbsp olive oil to a large skillet and add chicken. Cook over medium heat until lightly browned and cooked through. About 6 minutes on each side. Remove chicken and set aside.
To the same skillet, add 1 tbsp oil and the onion. Cook for 2-3 minutes until softened. Then add in the garlic, sun dried tomatoes, Italian seasoning and crushed red pepper. Cook until fragrant, about 2 minutes.
Pour in chicken broth, scraping the bottom and sides of pan to get off any browned bits. Then slowly add cream. Stir to combine and bring to a simmer. Let simmer for 3-4 minutes, stirring occasionally. Then add in the parmesan. Stir to combine and let simmer until cheese is melted and sauce thickens slightly, about 4-5 minutes. Stir in spinach.
Add drained pasta to the pan with the sauce. Slice chicken breasts and serve on top of pasta. Parmesan cheese, crushed red pepper and parsley make great garnishes!