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Ingredients

• Two 1 3/4-inch-thick slices challah bread from middle of loaf
• 2 ounces grated Gruyre cheese (about 3/4 cup)
• 1/4 small red onion, very thinly sliced (I used a mandoline)
• 2 large eggs, lightly beaten
• 3/4 cup whole milk
• 1/4 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 2 tablespoons extra virgin olive oil
• 1 small apple, cored, quartered and very thinly sliced (I used a mandoline here, too)

Description

Serious Eats