Step 1

Preheat oven to 375 degrees with rack in the middle of the oven. In a large bowl, beat eggs with a fork. Beat in liqueur, sugar, large pinch of salt, and orange zest and juice. Add milk and beat until combined.

Step 2

Line 2 rimmed baking sheets with nonstick baking mats. Gently dip brioche, one slice at a time, into egg mixture to coat, placing 6 slices on each baking sheet. Transfer to oven and bake for 12 minutes. Increase oven temperature to broil. Cook until golden brown, 2 to 3 minutes. Repeat with second baking sheet. Serve with butter and sugar or maple syrup.