# Ingredients:
→ Custard Mixture
01 - 3 large eggs
02 - 3/4 cup whole milk
03 - 1/4 cup heavy cream
04 - 1 tablespoon granulated sugar
05 - 1/2 teaspoon kosher salt
06 - 1/2 teaspoon ground black pepper
07 - 1/2 teaspoon Dijon mustard (optional)
→ Bread
08 - 8 slices brioche or challah bread, each about 1/2-inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese, or a combination
→ For Cooking
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil (such as canola)
# Instructions:
01 - Whisk together eggs, whole milk, heavy cream, sugar, kosher salt, black pepper, and Dijon mustard in a shallow bowl until fully blended.
02 - Lay out four bread slices on a clean surface. Layer two slices of cheese onto each and top with remaining bread slices to form sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat. Add 1 tablespoon unsalted butter and 1/2 tablespoon neutral oil, swirling to coat the surface evenly.
04 - Immerse each sandwich into the custard mixture, coating both sides thoroughly without letting the bread become soggy.
05 - Place dipped sandwiches onto the skillet. Cook for 3 to 4 minutes per side, pressing gently, until the exterior turns golden brown and cheese is melted. Cook in batches if necessary, adding butter and oil as needed.
06 - Transfer cooked sandwiches to a cutting board. Allow to rest for 2 minutes before slicing and serving warm.