# What You'll Need:
→ 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, 1/2-inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese, or a combination
→ Cooking Fats
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil (e.g. canola)
# Directions:
01 - Whisk eggs, milk, heavy cream, sugar, salt, pepper, and Dijon mustard in a shallow bowl until fully blended.
02 - Place 4 bread slices on a clean surface, top each with 2 cheese slices, then cover with remaining bread to form sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat, add 1 tablespoon butter and 1/2 tablespoon oil, swirling to coat the surface.
04 - Dip each sandwich into the custard mixture, making sure both sides are coated without oversaturating.
05 - Place custard-coated sandwiches in the skillet; cook 3 to 4 minutes per side, pressing gently, until golden and cheese melts. Add more butter and oil if cooking in batches.
06 - Transfer sandwiches to a cutting board, let rest 2 minutes, then slice and serve warm.