Classic Monte Cristo Sandwich

Ingredients (9)

• 3 slices white sandwich bread
• 1/4 pound ham (or turkey)
• 1/2 cup grated gouda cheese
• 2 teaspoons mayonnaise (opt.)
• 1 large egg
• 2 tablespoons milk
• 1 teaspoon paprika
• Salt and pepper
• 2 tablespoons butter, for cooking