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Bring a large pot of salted water to a rolling boil over high heat. Add the fettuccine pasta and cook according to package directions until al dente, typically 8-10 minutes. Reserve 1 cup of the pasta cooking water before draining the pasta. Set aside.
While the pasta cooks, heat 1 tablespoon of the olive oil in a large skillet or Dutch oven over medium-high heat. Add the diced chicken, season with a pinch of salt and pepper, and cook until browned and cooked through, about 5-7 minutes. Remove the cooked chicken from the skillet and set aside.
Add the remaining 1 tablespoon of olive oil and the butter to the same skillet. Add the chopped yellow onion and cook until softened and translucent, about 4-5 minutes. Add the minced garlic and cook for another 1 minute until fragrant, being careful not to burn it.
Pour in the vegetable broth and heavy cream. Bring the mixture to a gentle simmer, then reduce the heat to low. Stir in the fresh spinach a handful at a time, allowing it to wilt before adding more, until all the spinach is incorporated and wilted, about 2-3 minutes.
Remove the skillet from the heat. Stir in the grated Parmesan cheese, the specified salt, black pepper, and optional nutmeg. Add the cooked chicken back to the skillet and stir to combine. If the sauce is too thick, add a splash of the reserved pasta cooking water until it reaches your desired consistency.
Add the drained fettuccine pasta directly into the skillet with the creamy spinach and chicken sauce. Toss well to coat all the pasta evenly. Serve immediately, garnished with additional grated Parmesan cheese.

Bring a large pot of salted water to a rolling boil over high heat. Add the fettuccine pasta and cook according to package directions until al dente, typically 8-10 minutes. Reserve 1 cup of the pasta cooking water before draining the pasta. Set aside.
While the pasta cooks, heat 1 tablespoon of the olive oil in a large skillet or Dutch oven over medium-high heat. Add the diced chicken, season with a pinch of salt and pepper, and cook until browned and cooked through, about 5-7 minutes. Remove the cooked chicken from the skillet and set aside.
Add the remaining 1 tablespoon of olive oil and the butter to the same skillet. Add the chopped yellow onion and cook until softened and translucent, about 4-5 minutes. Add the minced garlic and cook for another 1 minute until fragrant, being careful not to burn it.
Pour in the vegetable broth and heavy cream. Bring the mixture to a gentle simmer, then reduce the heat to low. Stir in the fresh spinach a handful at a time, allowing it to wilt before adding more, until all the spinach is incorporated and wilted, about 2-3 minutes.
Remove the skillet from the heat. Stir in the grated Parmesan cheese, the specified salt, black pepper, and optional nutmeg. Add the cooked chicken back to the skillet and stir to combine. If the sauce is too thick, add a splash of the reserved pasta cooking water until it reaches your desired consistency.
Add the drained fettuccine pasta directly into the skillet with the creamy spinach and chicken sauce. Toss well to coat all the pasta evenly. Serve immediately, garnished with additional grated Parmesan cheese.