Season the chicken breast on both sides with salt, black pepper, and Italian seasoning.
Heat the olive oil and butter in a large skillet over medium heat until melted and hot.
Add the seasoned chicken to the skillet and cook for 5 to 7 minutes per side until golden brown and cooked through.
Remove the chicken from the skillet and slice it into strips.
Add the minced garlic and cook for about 1 minute until fragrant.
Stir in the chopped sun-dried tomatoes and cook for another 2 minutes.
Pour in the chicken broth to deglaze the pan, scraping up any browned bits from the bottom.
Add the heavy cream and bring the mixture to a gentle simmer.
Stir in the grated Parmesan cheese until melted and the sauce begins to thicken.
Fold in the baby spinach and red pepper flakes, cooking until the spinach wilts.
Return the sliced chicken to the skillet and add the cheese tortellini.
Simmer for 3 to 5 minutes until the tortellini is tender and heated through.
Garnish with the chopped fresh parsley and serve immediately.
Notes
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, add a splash of chicken broth or cream to loosen the sauce.