# What You'll Need:
→ Custard Mixture
01 - 3 large eggs
02 - 0.75 cup whole milk
03 - 0.25 cup heavy cream
04 - 1 tablespoon granulated sugar
05 - 0.5 teaspoon kosher salt
06 - 0.5 teaspoon ground black pepper
07 - 0.5 teaspoon Dijon mustard (optional)
→ Bread
08 - 8 slices brioche or challah bread, about 0.5-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
# How To Make It:
01 - Whisk together eggs, whole milk, heavy cream, sugar, salt, pepper, and Dijon mustard in a shallow bowl until homogeneous.
02 - Place 4 bread slices on a flat surface, top each with 2 cheese slices, then cover with remaining bread slices to seal sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat; add 1 tablespoon butter and 0.5 tablespoon oil, swishing to coat evenly.
04 - Dip each sandwich into the custard mixture, coating both sides thoroughly without oversaturating.
05 - Place custard-coated sandwiches in skillet; cook 3 to 4 minutes per side, gently pressing until golden brown and cheese melts. Repeat as needed, replenishing butter and oil.
06 - Transfer sandwiches to a cutting board, let rest 2 minutes before slicing and serving warm.