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Bring a large pot of salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Reserve 1 cup of pasta water before draining the pasta. Set aside.

While the pasta is cooking, heat the olive oil in a large skillet or Dutch oven over medium heat. Add the chopped yellow onion and cook until softened and translucent, about 5-7 minutes.

Add the minced garlic and red pepper flakes to the skillet. Cook for 1 minute more, until fragrant, being careful not to burn the garlic.

Pour in the crushed tomatoes, salt, and black pepper. Stir well and bring the sauce to a gentle simmer. Reduce the heat to low, cover, and let it cook for 10 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until fully combined and the sauce is creamy. Add the fresh spinach in batches, stirring until it wilts completely into the sauce.

Add the cooked and drained pasta to the sauce. Toss to coat evenly. If the sauce is too thick, add a splash or two of the reserved pasta water until it reaches your desired consistency.

Serve immediately, garnished with additional grated Parmesan cheese and fresh chopped basil.

Bring a large pot of salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Reserve 1 cup of pasta water before draining the pasta. Set aside.

While the pasta is cooking, heat the olive oil in a large skillet or Dutch oven over medium heat. Add the chopped yellow onion and cook until softened and translucent, about 5-7 minutes.

Add the minced garlic and red pepper flakes to the skillet. Cook for 1 minute more, until fragrant, being careful not to burn the garlic.

Pour in the crushed tomatoes, salt, and black pepper. Stir well and bring the sauce to a gentle simmer. Reduce the heat to low, cover, and let it cook for 10 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until fully combined and the sauce is creamy. Add the fresh spinach in batches, stirring until it wilts completely into the sauce.

Add the cooked and drained pasta to the sauce. Toss to coat evenly. If the sauce is too thick, add a splash or two of the reserved pasta water until it reaches your desired consistency.

Serve immediately, garnished with additional grated Parmesan cheese and fresh chopped basil.
