# What You'll Need:
→ Custard Mixture
01 - 3 large eggs
02 - ¾ cup whole milk
03 - ¼ cup heavy cream
04 - 1 tablespoon granulated sugar
05 - ½ teaspoon kosher salt
06 - ½ teaspoon ground black pepper
07 - ½ teaspoon Dijon mustard (optional)
→ Bread
08 - 8 slices brioche or challah bread, ½-inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese
→ For Cooking
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil (such as canola)
# Directions:
01 - Whisk together eggs, milk, heavy cream, sugar, salt, pepper, and Dijon mustard in a shallow bowl until smooth.
02 - Place 4 bread slices on a work surface, layer each with 2 slices of cheese, then top with remaining bread slices to form sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat; add 1 tablespoon butter and ½ tablespoon oil, swirling to coat the surface.
04 - Carefully dip each sandwich in the custard mixture, coating both sides without letting it soak through.
05 - Place sandwiches in the skillet and cook 3 to 4 minutes per side, pressing gently, until golden and cheese has melted. Add more butter and oil as necessary and cook in batches if needed.
06 - Transfer cooked sandwiches to a cutting board, let rest for 2 minutes, then slice and serve warm.