Cook the ravioli according to the package directions. Drain them and return to the pot.
Meanwhile, heat the oil in a large skillet over medium heat. Add the zucchini, 1/2 teaspoon salt, and 1/4 teaspoon pepper and cook until just tender, 4 to 5 minutes. Add the garlic and cook for 2 minutes.
Add the zucchini mixture and 1/4 cup of the Parmesan to the ravioli and toss gently to combine. Serve with the remaining 1/4 cup of Parmesan.