Ritz Cracker Party Sandwiches

INGREDIENTS

48 Ritz crackers
8 slices deli ham
8 slices Swiss cheese
4 tablespoons butter, melted
2 teaspoons Dijon mustard

1 teaspoon Worcestershire sauce
1/2 teaspoon garlic powder
1 teaspoon poppy seeds
1/2 teaspoon dried minced onion