Instructions

• Preheat the oven to 425°F and place a rack in the middle position. Set a large baking sheet nearby.
• Arrange the 6 slices of bread on the baking sheet with the sides you want to top facing up. Spread the 2 tablespoons softened butter over the opposite side of each slice, then flip each slice so the buttered side is facing down and the unbuttered side is facing up.
• In a medium bowl, whisk together the 3 large eggs, 2 teaspoons Dijon mustard, and 2 teaspoons Worcestershire sauce until smooth.
• Stir the 7–8 ounces shredded aged Irish cheddar and ½ teaspoon cracked black pepper into the egg mixture until evenly combined.
• Spoon the cheese mixture evenly over the unbuttered side of each slice (divide into 6 portions). Spread each portion into an even layer, leaving a small border (~1/4 inch) around the edges to help prevent spilling.
• Bake on the middle rack for 8–12 minutes, until the edges of the bread are golden and the center of the cheese mixture is puffed and set.
• Remove the baking sheet from the oven, sprinkle the 1 tablespoon fresh chopped chive over the toasties, and serve immediately.