# 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 (approximately 1/2-inch thick)
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese, or a blend
→ For Cooking
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil (such as canola)
# Directions:
01 - Whisk together eggs, whole milk, heavy cream, granulated sugar, kosher salt, black pepper, and Dijon mustard in a shallow bowl until fully combined.
02 - Arrange 4 slices of bread on a clean surface, layering each with 2 slices of cheese, then cover with remaining bread slices to create sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat; add 1 tablespoon butter and 1/2 tablespoon oil, swirling to evenly coat the surface.
04 - Briefly dip each sandwich in the custard mixture, coating both sides thoroughly without oversaturating.
05 - Place custard-coated sandwiches onto the skillet and cook 3 to 4 minutes per side, pressing lightly, until golden brown and cheese is melted; cook in batches if necessary, adding more butter and oil as needed.
06 - Transfer sandwiches to a cutting board; allow to rest for 2 minutes before slicing and serving warm.
