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 with salt, pepper, and Italian seasoning. Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook until golden brown and cooked through, 5 to 7 minutes. Remove from the skillet and set aside.
03 - In the same skillet, melt the butter over medium heat. Add the chopped onion and sauté for 2 to 3 minutes until softened. Add the minced garlic and cook for 1 minute until fragrant.
04 - Pour in the chicken broth to deglaze the skillet, scraping up any browned bits from the bottom. Reduce heat to medium. Stir in the heavy cream and Parmesan cheese, continuing to stir until the cheese melts and the sauce thickens slightly, about 3 minutes.
05 - Add the fresh spinach to the skillet and stir gently until wilted, about 1 to 2 minutes.
06 - Return the seared chicken to the skillet along with the cooked tortellini. Gently toss everything together until evenly coated in the creamy garlic sauce. Adjust seasoning with additional salt and pepper if needed. Serve immediately, garnished with extra Parmesan and chopped fresh parsley.