01 - Bring a large pot of salted water to a rolling boil. Cook tortellini according to package directions until al dente. Drain well and set aside.
02 - While the tortellini cooks, season the diced chicken breasts evenly with salt, pepper, and Italian seasoning.
03 - Heat olive oil in a large skillet over medium-high heat. Add the seasoned chicken and cook for 5 to 7 minutes, turning occasionally, until golden brown and cooked through. Transfer to a plate and set aside.
04 - In the same skillet, melt the butter over medium heat. Add the chopped onion and sauté for 2 to 3 minutes until softened. Stir in the minced garlic and cook for 1 minute until fragrant.
05 - Pour in the chicken broth and deglaze the skillet, scraping up any browned bits from the bottom. Reduce heat to medium.
06 - Stir in the heavy cream and Parmesan cheese. Continue stirring until the cheese is fully melted and the sauce thickens slightly, about 3 minutes.
07 - Add the fresh spinach to the skillet and gently stir until wilted, about 1 to 2 minutes.
08 - Return the seared chicken to the skillet along with the cooked tortellini. Gently toss everything together until evenly coated in the creamy sauce. Adjust seasoning with additional salt and pepper as needed.
09 - Serve immediately, garnished with extra Parmesan and freshly chopped parsley if desired.