# 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, approximately 0.5 inch thick each
→ 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
# Method:
01 - In a shallow bowl, whisk together eggs, milk, heavy cream, sugar, salt, pepper, and Dijon mustard until homogenous.
02 - Arrange 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. Add 1 tablespoon butter and 0.5 tablespoon oil, swirling to coat evenly.
04 - Dip each sandwich into the custard mixture, coating both sides thoroughly without over-soaking.
05 - Place custard-dipped sandwiches onto the skillet. Cook for 3 to 4 minutes per side, pressing gently, until golden brown and cheese is melted. Work in batches if needed, adding butter and oil as necessary.
06 - Transfer cooked sandwiches to a cutting board. Let rest for 2 minutes, then slice and serve warm.