Croque Madame Casserole with Ham and Gruyère – wilburgoltermann.com

Ingredients

• 12 3/4” thick slices day-old white bread (a square-shaped loaf works best)
• 6 tbsp unsalted butter
• 3 tbsp flour
• 3 cups milk
• ¼ tsp ground nutmeg
• 1 ¼ tsp kosher salt, divided
• ½ tsp ground black pepper, divided
• 3 ¼ cups grated gruyère (about 10 oz), divided
• ¼ cup dijon mustard
• 12 thin slices Black Forest ham (about 10 ounces)
• 6 large eggs
• non-stick vegetable oil