# Ingredient List:
→ 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, about 1/2-inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese, or a mixture
→ For Cooking
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil (such as canola)
# How to Make:
01 - Whisk together eggs, whole milk, heavy cream, sugar, salt, pepper, and Dijon mustard in a shallow bowl until smooth and fully combined.
02 - Lay out 4 slices of bread, top each with 2 slices of cheese, then cover with the remaining bread slices to form 4 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 - Submerge each sandwich into the custard mixture, coating both sides thoroughly without oversaturating.
05 - Place custard-coated sandwiches on the skillet. Cook approximately 3 to 4 minutes per side, pressing gently until golden brown and cheese is melted. Repeat in batches if needed, replenishing butter and oil as required.
06 - Transfer cooked sandwiches to a cutting board. Allow to rest for 2 minutes before slicing and serving warm.