Bork, Bork, Bork: Croque Monsieur

Ingredients

• 1 Tbsp butter
• 4 slices cooked ham
• 1 tsp dijon mustard
• 2 eggs
• 2 cups grated Gruyere cheese
• 2 Tbsp mayonnaise
• 2 Tbsp milk
• 1 Tbsp oil
• 8 slices white bread (thin)