# What you 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 (canola)
# Directions:
01 - In a shallow bowl, whisk together eggs, whole milk, heavy cream, sugar, salt, black pepper, and Dijon mustard until fully blended.
02 - Place 4 slices of bread on a work surface. Top each with 2 slices of cheese and cover with remaining bread to form 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 soaking through.
05 - Place custard-coated sandwiches on skillet. Cook 3 to 4 minutes per side, pressing gently, until golden brown and cheese is melted. Work in batches, adding butter and oil as needed.
06 - Transfer cooked sandwiches to a cutting board. Let rest 2 minutes, then slice and serve warm.