01 - Bring a large pot of salted water to a rolling boil. Cook tortellini according to package instructions until al dente. Drain well and set aside.
02 - While tortellini cooks, season diced chicken breasts evenly with salt, pepper, and Italian seasoning.
03 - Heat olive oil in a large skillet over medium-high heat. Add seasoned chicken in a single layer and cook until golden brown and cooked through, 5–7 minutes. Transfer to a plate and set aside.
04 - In the same skillet, melt butter over medium heat. Add chopped onion and sauté for 2–3 minutes until softened. Stir in minced garlic and cook for 1 minute until fragrant.
05 - Pour in chicken broth and deglaze the skillet, using a wooden spoon to scrape up all browned bits from the bottom. Reduce heat to medium.
06 - Stir in heavy cream and Parmesan cheese. Continue stirring until the cheese has fully melted and the sauce thickens slightly, about 3 minutes.
07 - Add fresh spinach to the skillet and gently stir until wilted, about 1–2 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 to taste. Serve immediately, garnished with extra Parmesan and fresh chopped parsley if desired.