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Preheat oven to 350°F.
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Place 24 RITZ® Crackers in the bottom of a 13×9 inch baking dish, flat side down. Place another 24 RITZ® Crackers in the bottom of another 13×9 inch baking dish. Tear the ham gently with your hands to create tiny strips (they do not need to be perfect) and lay a lightly folded slice on each RITZ® Cracker.
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Cut the cheese into 1 inch pieces and place one piece of cheese on top of the ham. Top each mini sandwich with another RITZ® Cracker, rounded side up.
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Place the butter in a microwave-safe bowl and microwave until melted, about 45 seconds. Gently whisk in the Dijon mustard, worcestershire sauce, and salt.
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Pour the butter mixture evenly over the mini sandwiches, dividing the mixture evenly between the two pans. Sprinkle the poppy seeds and the dried onion flakes evenly over the top.
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Bake for 10–12 minutes, or until the cheese is melted and the tops of the Ritz Crackers are lightly golden brown.
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Transfer to a serving platter and serve while warm.