In a large skillet, heat the olive oil over medium heat. Once hot, add the diced chicken breast. Season with salt, pepper, and Italian seasoning. Cook until the chicken is browned and cooked through, about 6-8 minutes.
Add the minced garlic to the skillet and sauté for an additional 1-2 minutes until fragrant.
Pour in the chicken broth and heavy cream, stirring to combine. Bring the mixture to a gentle simmer.
Add the fresh tortellini to the skillet, and cook according to package instructions (usually about 3-5 minutes), stirring occasionally.
Once the tortellini is tender and the sauce has thickened slightly, stir in the chopped spinach and grated Parmesan cheese. Cook for another 2 minutes until the spinach has wilted.
Taste and adjust seasoning with more salt and pepper if needed. Remove from heat.