Bring 10 cups of water to a boil in a large pot. Season generously with salt and add the penne pasta. Cook until al dente per package instructions. Reserve 1 cup of pasta water, then drain the pasta.
In a saucepan, heat the sun dried tomato oil over medium-low heat. Sauté minced garlic until golden, about 20 seconds.
Stir in tomato paste and cook for 30 seconds to deepen flavor.
Pour in the heavy cream, stirring to combine. Add sun dried tomatoes, Italian seasoning, and crushed red pepper flakes. Simmer gently.
Reduce heat to low and stir in parmesan cheese until melted and smooth.
Pour sauce into the pasta pot. Add the drained pasta and chopped spinach, along with ½ cup reserved pasta water. Cook until spinach wilts.
Season with salt and pepper. Off heat, stir in fresh basil, lemon juice, and paprika if desired. Thin with more pasta water if needed.
Serve hot, garnished with extra parmesan and basil if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.