Ham and Cheese Sliders

Bahan-bahan (12 porsi)

• 4 tablespoons unsalted butter, (melted)
• 1 tablespoon Dijon mustard
• 2 teaspoons Worcestershire sauce
• 1½ tablespoons poppy seeds
• ½ teaspoon garlic powder
• Heaping ¼ teaspoon salt
• 1 (12-count pack) square soft white dinner rolls, (such as Kings Hawaiian Sweet Rolls)
• 2 tablespoons Dijon mustard
• ⅔ lb sliced Swiss cheese
• ½ lb sliced Black Forest ham