# What You 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, approximately 0.5 inch thick
→ Cheese Filling
09 - 8 slices Gruyère or sharp cheddar cheese, or a combination
→ For Cooking
10 - 2 tablespoons unsalted butter
11 - 1 tablespoon neutral oil such as canola
# How To Make:
01 - In a shallow bowl, thoroughly whisk together eggs, milk, heavy cream, sugar, salt, pepper, and Dijon mustard until smooth.
02 - Lay 4 slices of bread on a work surface, top each with 2 slices of cheese, then cover with remaining bread slices to form sandwiches.
03 - Warm a large nonstick skillet or griddle over medium heat and add 1 tablespoon butter and 0.5 tablespoon oil, swirling to coat evenly.
04 - Immerse each sandwich into the custard mixture, coating both sides thoroughly without soaking through.
05 - Place the custard-coated sandwiches in the skillet and cook for 3 to 4 minutes per side, pressing gently, until golden brown and cheese melts. Cook in batches as needed, replenishing butter and oil.
06 - Transfer sandwiches to a cutting board, allow to rest for 2 minutes, then slice and serve warm.