01 - Bring a large pot of salted water to a rolling boil. Cook the cheese 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. 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 the chicken to a plate 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 and translucent. Stir in the minced garlic and cook for 1 minute until fragrant, being careful not to let it brown.
04 - Pour in the chicken broth to deglaze the pan, scraping up any browned bits from the bottom. Reduce the heat to medium-low and stir in the heavy cream and Parmesan cheese. Continue stirring for about 3 minutes until the cheese is fully melted and the sauce has thickened slightly.
05 - Add the fresh baby spinach to the skillet and gently stir for 1 to 2 minutes until just wilted.
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. Taste and adjust seasoning with additional salt and pepper if needed. Serve immediately, garnished with extra Parmesan and fresh chopped parsley.