Squash and Tomato Oven Frittata

Bahan-bahan (6 porsi)

• 5 medium (about 1½ pounds total) zucchini or yellow squash, (in any combination)
• 1 teaspoon salt
• 3 tablespoons olive oil, (divided)
• 2 medium shallots or green onions, (including green tops, chopped)
• 1 medium garlic clove, (minced)
• 2 medium Roma tomatoes, (seeded and diced)
• 6 large eggs
• 2 tablespoons freshly grated Parmesan cheese
• freshly ground black pepper, (to taste)
• 1 tablespoon minced fresh oregano
• ½ cup shredded Gruyère cheese
• 3 tablespoons minced fresh basil
• 2 tablespoons minced fresh flat-leaf Italian parsley