Make-Ahead Mediterranean Egg Casserole Recipe | Eggland's Best

Ingredients

• 12 Eggland's Best eggs, large
• 1 teaspoon olive oil, plus more for the pan
• 1/2 small red onion
• 2 cloves garlic
• 1 (14-ounce) can water-packed artichokes
• 1 cup grape or cherry tomatoes (about 5 ounces)
• 1 tablespoon fresh oregano leaves
• 4 ounces feta cheese, crumbled (about 1 cup)
• 1/2 ounce Parmesan cheese, finely grated (about 1/4 cup)
• 1 1/4 teaspoons kosher salt, divided
• 6 ounces baby spinach (about 6 cups)
• 2 cups whole or 2% milk
• 1/4 teaspoon freshly ground black pepper