Greek Salad-Inspired Quiche

Directions

1. Preheat oven to 375°. In a 9-in. cast-iron or other ovenproof skillet, heat oil over medium-high heat. Add tomatoes, green peppers and onion; cook and stir until vegetables are tender, 6-7 minutes; drain. Add spinach and garlic; cook and stir until spinach is wilted, 1-2 minutes. Remove from heat and stir in feta and olives.
2. In a large bowl, whisk eggs, milk, oregano, salt and pepper flakes until blended. Pour over vegetables.
3. Bake until a knife inserted in center comes out clean, 20-25 minutes. Let stand 10 minutes before serving.