1 tablespoon olive oil1 small yellow onion, grated2 cups frozen chopped spinach, thawed and squeezed dry1/2 cup crumbled cooked bacon (about 5 pieces) or chopped ham1 cup swiss or gruyere cheese, gratedsalt and pepper to taste12 eggs Preheat oven to 425°F.In a 12-inch cast-iron skillet, heat oil over medium-high heat. Add onion and spinach, […]