Basically Croque Monsieur

Ingredients

• 4 oz. Gruyère
• 2 Tbsp. unsalted butter
• 2 Tbsp. all-purpose flour
• 1¼ cups whole milk
• ¾ tsp. kosher salt
• ¼ tsp. freshly ground nutmeg
• 1 Tbsp. Dijon mustard, plus more for serving
• 8 ½"-thick slices country-style or sourdough bread
• 8 oz. sliced ham
• Cornichons (for serving)

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