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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 to the skillet and cook for another 1 minute until fragrant, being careful not to burn it.

Stir in the undrained diced tomatoes, dried oregano, and red pepper flakes. Bring the sauce to a simmer and cook for 8-10 minutes, allowing the flavors to meld and the sauce to thicken slightly.

Reduce the heat to low and stir in the heavy cream and grated Parmesan cheese. Mix until the cheese is melted and the sauce is creamy.

Add the fresh spinach to the sauce, a handful at a time, stirring until it wilts completely. This should take about 2-3 minutes.

Add the cooked and drained pasta to the skillet with 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.

Season with salt and freshly ground black pepper to taste. Garnish with fresh chopped basil and additional grated Parmesan cheese before serving.


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 to the skillet and cook for another 1 minute until fragrant, being careful not to burn it.

Stir in the undrained diced tomatoes, dried oregano, and red pepper flakes. Bring the sauce to a simmer and cook for 8-10 minutes, allowing the flavors to meld and the sauce to thicken slightly.

Reduce the heat to low and stir in the heavy cream and grated Parmesan cheese. Mix until the cheese is melted and the sauce is creamy.

Add the fresh spinach to the sauce, a handful at a time, stirring until it wilts completely. This should take about 2-3 minutes.

Add the cooked and drained pasta to the skillet with 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.

Season with salt and freshly ground black pepper to taste. Garnish with fresh chopped basil and additional grated Parmesan cheese before serving.
