Heat the olive oil in a large skillet over medium heat. Add the chicken pieces and season with salt and pepper. Cook until the chicken is browned on all sides and cooked through, about 6 to 7 minutes. Remove the chicken to a plate and set aside.
In the same skillet, add the minced garlic and sun-dried tomatoes. Stir for 1 minute until the garlic becomes fragrant.
Add the gnocchi and pour in the heavy cream. Sprinkle in the Italian seasoning. Stir gently and let the mixture simmer for 4 to 5 minutes so the gnocchi softens and the sauce thickens slightly.
Return the cooked chicken to the skillet. Stir in the grated parmesan cheese until it melts into the sauce.
Add the fresh spinach and stir until it wilts, about 2 minutes. Taste and adjust salt and pepper if needed before serving.