01 - Bring a large pot of generously salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Reserve 1/2 cup of the starchy pasta water before draining. Set the drained pasta aside.
02 - While the pasta cooks, pat the chicken breasts dry with paper towels. Season both sides generously with salt, freshly ground black pepper, and the Italian seasoning blend, pressing the spices into the meat.
03 - Heat the olive oil in a large skillet over medium-high heat until it shimmers. Carefully lay the seasoned chicken breasts in the pan and sear for 5 to 6 minutes per side, until deeply golden brown and cooked through to an internal temperature of 165°F. Transfer the chicken to a cutting board and let it rest for 5 minutes before slicing thinly against the grain.
04 - Reduce the heat to medium in the same skillet. Melt the butter, then add the minced garlic. Sauté, stirring constantly, until fragrant and lightly golden, about 1 minute. Add the sliced sun-dried tomatoes and cook for an additional minute, allowing their concentrated flavor to bloom.
05 - Pour in the chicken broth and bring to a gentle simmer, using a wooden spoon to scrape up all the caramelized fond from the bottom of the skillet. Let the liquid reduce for 1 to 2 minutes.
06 - Stir in the heavy cream and half a cup of freshly grated Parmesan cheese. Simmer gently for 2 to 3 minutes, stirring frequently, until the sauce coats the back of a spoon. Add the crushed red pepper flakes if desired for a subtle heat.
07 - Return the sliced chicken to the skillet along with the cooked pasta. Toss everything together until every strand or piece is coated in the creamy sauce. If the sauce seems too thick, loosen it with a splash of the reserved pasta water until it reaches the desired consistency.
08 - Taste and adjust the seasoning with additional salt and pepper as needed. Serve immediately, garnished with freshly sliced basil leaves and an extra shower of Parmesan cheese.