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

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

Add the minced garlic, dried oregano, and red pepper flakes (if using) to the skillet. Cook for 1 minute until fragrant, being careful not to burn the garlic.

Pour in the crushed tomatoes, salt, and black pepper. Bring the sauce to a simmer, then reduce heat to low, cover, and let it cook for 10-15 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until well combined and the cheese has melted into the sauce.

Add the fresh spinach to the sauce, stirring until it wilts completely, about 2-3 minutes.

Add the cooked and drained rigatoni pasta to the sauce. Toss to coat the pasta 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 fresh chopped basil and extra grated Parmesan cheese, if desired.

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

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

Add the minced garlic, dried oregano, and red pepper flakes (if using) to the skillet. Cook for 1 minute until fragrant, being careful not to burn the garlic.

Pour in the crushed tomatoes, salt, and black pepper. Bring the sauce to a simmer, then reduce heat to low, cover, and let it cook for 10-15 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until well combined and the cheese has melted into the sauce.

Add the fresh spinach to the sauce, stirring until it wilts completely, about 2-3 minutes.

Add the cooked and drained rigatoni pasta to the sauce. Toss to coat the pasta 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 fresh chopped basil and extra grated Parmesan cheese, if desired.
