01 - Bring a large pot of salted water to a rolling boil. Add the cheese tortellini and cook according to package instructions until they float and are tender. Drain through a colander and set aside.
02 - While the tortellini cooks, heat olive oil and butter in a large skillet over medium-high heat. Add the chicken pieces and season with salt, pepper, and dried Italian herbs. Sear until golden brown and cooked through, approximately 6 to 8 minutes. Transfer the chicken to a plate and set aside.
03 - Reduce the heat to medium. In the same skillet, add the chopped onion and cook until softened and translucent, about 3 minutes. Add the minced garlic and sauté until fragrant, approximately 30 seconds, stirring constantly to prevent burning.
04 - Pour in the heavy cream and add the cream cheese and grated Parmesan. Stir continuously and simmer gently until all the cheese has melted and the sauce is smooth and velvety, about 2 to 3 minutes.
05 - Add the chopped fresh spinach to the skillet and fold it into the sauce. Cook just until the leaves are wilted and bright green, approximately 1 to 2 minutes.
06 - Return the seared chicken and cooked tortellini to the skillet. Gently toss everything together until all components are evenly coated in the creamy garlic sauce. Taste and adjust seasoning with additional salt and pepper if needed.
07 - Serve immediately while hot, garnished with extra grated Parmesan and freshly chopped parsley.