PREPARATION:
- Heat 3 teaspoons olive oil in 10-inch nonstick skillet over medium heat. Add onion; cook until tender, stirring occasionally. Remove onion from skillet with slotted spoon; set aside.
- Lightly beat eggs in medium bowl. Add onion, spinach, cheese and seasonings.
- Heat remaining 1-1/2 teaspoons oil in same skillet. Add egg mixture. Cook 5 minutes or until bottom is lightly browned.
- Place large plate over frittata. Invert frittata onto plate. Return frittata, uncooked side down, to skillet.
- Continue cooking 4 minutes or until set. Cut into wedges to serve. Garnish, if desired.
