Cook and drain the penne pasta in salted water according to the package directions.
While the pasta is cooking, season the chicken with the garlic powder, salt, and pepper. Heat the olive oil in a large skillet over medium-high heat. Sauté the chicken strips until browned and cooked through. Stir in the minced garlic and for about one minute.
Pour the alfredo sauce over the cooked chicken, and then stir in the spinach. Continue to cook until the spinach is wilted.
Drain the penne, then add it to the alfredo mixture. Toss well to coat.
Sprinkle the parmesan cheese over the top and serve hot.