Preheat oven to 450 degrees F. Lightly prick side of pie crust with fork. Bake 5 minutes or until lightly browned; set aside. Reduce oven to 350 degrees F.
Spray medium skillet with cooking spray; heat over medium heat. Add onion, zucchini and bell pepper; cook and stir 5 to 8 minutes, or until crisp-tender. Drain; pat dry with paper towel. Add potato to vegetables; spoon vegetable mixture into crust.
Combine Egg Beaters, milk, oregano and basil. Season with black pepper, if desired. Pour over vegetable mixture. Cover edge of crust with aluminum foil to prevent overbrowning.
Bake 45 to 50 minutes or until knife inserted in center comes out clean. Let stand 10 minutes before cutting into 6 slices.