Preheat the oven to 375 degrees F. In a large skillet, melt the margarine over medium heat. Add the zucchini and onion and saute until the onion is golden, about 10 minutes. Remove from the heat. Stir in the parsley, salt, pepper, garlic powder, basil, and oregano. Combine the eggs and mozzarella and stir into the zucchini mixture.
Place the crescent rolls in an ungreased 10-inch pie plate. Press over the bottom and up the sides to form a crust. Spread the crust with the mustard. Pour the vegetable mixture into the crust. Bake for 18 to 20 minutes or until the center is set. If the crust begins to brown before the center is set, cover with aluminum foil. Let stand for 10 minutes before serving.