The Best Spinach and Mushroom Crustless Quiche Recipe Ever - Beard and Bonnet

Ingredients

• 4 large eggs
• 2 ounces (56 grams) feta cheese, crumbled
• ¼ cup grated Parmesan cheese
• ½ cup shredded mozzarella cheese
• 1 (10 ounces / 283 grams) box frozen chopped spinach, thawed and moisture squeezed out
• 8 ounces (226 grams) mushrooms, sliced thinly
• 1 clove garlic, minced
• 1 tablespoon cooking oil, divided
• 1 cup milk
• 1/8 teaspoon salt
• ¼ teaspoon pepper