Preheat oven to 325.
Mix together dried minced onion, poppy seeds, butter,and mustard.
Slice dinner rolls in half. Cut ham and swiss cheese to fit the dinner rolls. Top bottom half with ham and swiss. Brush inside top half with butter mixture. Assemble sandwich. Brush top of assembled sandwich with butter mixture. Place sandwich on a lightly sprayed baking sheet.
Bake sandwiches for 20 minutes. Serve hot or cold.
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