Boil the penne pasta in salted water according to package directions. Drain and set aside.
Cook the Chicken:
Season chicken breasts with salt, pepper, and a bit of Italian seasoning. Grill or pan-sear until golden and cooked through (internal temp 75°C / 165°F).
Slice the chicken thinly and set aside.
Prepare the Sauce:
In a large skillet, heat olive oil over medium heat.
Add garlic and sauté for 1 minute until fragrant.
Stir in sun-dried tomatoes and cook for another 1–2 minutes.
Pour in heavy cream and bring to a simmer.
Stir in Parmesan cheese and Italian seasoning. Let the sauce thicken slightly.
Add Spinach:
Add the spinach and cook until wilted.
Combine Everything:
Add cooked pasta and sliced grilled chicken into the sauce.
Toss to combine well. Adjust seasoning with salt, pepper, and red pepper flakes if desired.
Serve:
Serve warm, topped with extra Parmesan if you like.