# 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, about 1/2 inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese
→ 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, kosher salt, black pepper, and optional Dijon mustard in a shallow bowl until fully blended.
02 - Lay 4 slices of bread on a clean surface. Place 2 slices of cheese atop each. Cover with remaining bread slices to complete 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 evenly.
04 - Immerse each sandwich in the custard mixture, coating both sides thoroughly without over-soaking.
05 - Place custard-coated sandwiches in the skillet. Cook 3 to 4 minutes per side, pressing gently until golden brown and cheese melts. Repeat in batches, adding more butter and oil as necessary.
06 - Transfer sandwiches to a cutting board and allow to rest for 2 minutes before slicing and serving warm.