Layered Frittata With Spinach, Tomatoes, and Nicoise Olives

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   ["Preheat oven to 400 degrees.", "In deep, 10"" non-stick, ovenproof skillet, over medium heat, warm 1 tbsp oil.", "Add onion, salt and pepper; cook 10-12 minutes.", "Stir in olives; transfer to small bowl.", "Add spinach, salt and pepper to pan; cook 2-4 minutes.", "Transfer to separate bowl.", "Add tomatoes, salt and pepper to pan, cook 2-3 minutes.", "Spread tomatoes across pan bottom.", "Pour one third of eggs on top, cook 1-2 minutes.", "Top with spinach and cheeses.", "Pour half of remaining eggs over cheeses; cook 2-3 minutes.", "Spread onion mixture on top.", "Pour remaining eggs over onion mixture; cook 2-3 minutes, using rubber spatula to lift cooked edges and allow uncooked eggs to flow underneath.", "Place skillet in oven and bake 10-15 minutes on until eggs are set and top is browned.", "Garnish with parsley and serve."]

* Per serving · 4 servings · Values may vary.