In small bowl with wire whisk or fork, beat eggs. Stir in cheese, garlic powder, basil, salt, pepper and nutmeg; set aside.
In 9- or 10-inch nonstick skillet with sloping sides (omelet or crepe pan), heat oil over medium heat. Add spinach; cover and cook 2 to 3 minutes, stirring once or twice and watching carefully to prevent burning, until spinach is slightly wilted (if necessary, add 2 tablespoons water if spinach becomes dry).
Reduce heat to low. Spread spinach evenly in skillet; top evenly with tomatoes. Pour egg mixture over top. Cover; cook 12 to 15 minutes or until bottom is lightly browned and top is set, lifting edges occasionally to allow uncooked egg mixture to flow to bottom of skillet. Cut into wedges.