By cooking.nytimes.com

Apple-Gruyère French Toast With Red Onion

Ingredients

2 servings

2slices challah bread

1 3/4-inch-thick, from middle of loaf

¾ cupGruyère cheese

grated

0.25red onion

small, very thinly sliced

2eggs

large, lightly beaten

¾ cupwhole milk

¼ teaspoonkosher salt

¼ teaspoonground black pepper

2 tablespoonsextra virgin olive oil

1apple

small, cored, quartered and very thinly sliced

eggs

Fried, for serving, optional

Instructions