Step 1 Whisk eggs, water, pepper, oregano and basil; set aside.
Step 2 Spray 8-inch (20 cm) non-stick skillet with cooking spray. Heat skillet over medium-high heat. Pour in egg mixture. As eggs set around edge of skillet, with spatula, gently lift cooked portions to allow uncooked egg to flow underneath. Cook until bottom is set and top is almost set.
Step 3 Lower heat to medium-low. Spread pizza sauce over frittata. Sprinkle pizza toppings and cheese over sauce.
Step 4 Cover skillet with lid and cook for another minute to melt cheese. Loosen frittata around edge of skillet, then slide frittata onto plate.