Instructions:

Preheat Oven:

Preheat your oven to 350°F (175°C).
Prepare Baking Sheet:

Line a baking sheet with parchment paper or aluminum foil for easy cleanup.
Cut Ham and Cheese:
Slice the deli ham and Swiss cheese into quarters to fit neatly on the crackers.
Assemble Sandwiches:

Place 24 Ritz crackers on the prepared baking sheet.
Top each cracker with a piece of ham and cheese.
Add another Ritz cracker on top to form a sandwich.
Make Butter Mixture:

In a small bowl, combine the melted butter, Dijon mustard, Worcestershire sauce, garlic powder, poppy seeds, and dried minced onion.
Stir well to mix all ingredients.
Apply Butter Mixture:

Using a pastry brush, generously brush the butter mixture over the tops of the assembled sandwiches.
Bake:

Bake in the preheated oven for 10-12 minutes, or until the cheese is melted and the tops are golden brown.
Serve:

Remove from the oven and let cool slightly before serving.
Enjoy these delightful mini sandwiches warm.
These mini ham and Swiss sandwiches are sure to be a crowd-pleaser at your next event!