Foryoueats: Boozy Caramel French Toast Casserole

Ingredients

• 1 stick (½ cup) unsalted butter, plus more for greasing the pan
• ¾ cup packed light brown sugar
• 2 tablespoons light corn syrup
• 1⅓ lbs brioche (you'll likely need two loaves but you won't use it all)
• 5 large eggs
• 1½ cups half-and-half
• 1 teaspoon vanilla extract
• 3 tablespoons Grand Marnier
• 1 teaspoon orange zest
• ¼ teaspoon salt