Start by boiling a large pot of salted water. Once boiling, add the rotini or casarecce pasta and cook according to package instructions until al dente. Drain and set aside, reserving about 1 cup of pasta water.
While the pasta cooks, season the chicken breasts with salt, pepper, and 1 teaspoon of Italian seasoning. In a large skillet over medium heat, melt 1 tablespoon of butter. Add the chicken and cook for about 6-7 minutes on each side, or until cooked through and no longer pink in the center. Remove the chicken from the skillet and let it rest before slicing it into bite-sized pieces.
In the same skillet, add another tablespoon of butter. Once melted, add the minced garlic and sauté for about 30 seconds until fragrant. Pour in the chicken broth and bring to a simmer, scraping up any browned bits from the bottom of the skillet.
Reduce the heat to low and stir in the heavy cream, remaining Italian seasoning, and Parmesan cheese. Allow the sauce to thicken slightly, about 3-5 minutes.
Add the sun-dried tomatoes and spinach to the sauce, stirring until the spinach is wilted. Return the sliced chicken to the skillet along with the cooked pasta. Toss everything together, adding reserved pasta water a little at a time if the sauce is too thick.
Serve the Marry Me Pasta in bowls, drizzling with extra Parmesan cheese and garnishing with chopped parsley or basil. For added flavor, a spoonful of basil pesto can be stirred in before serving.