1. On low heat, in a small sauce pan add butter, mustard, poppy seeds, onion flakes & Worcestershire sauce. Heat until butter is melted and onion hydrated, about 5 minutes. Remove from heat & set aside. 2. Slice all of the rolls in half and place the bottom halves in a 9x13 baking dish or foil lined baking sheet. Lightly brush butter sauce on bottom half of rolls, you don't need much. 3. Divide the shaved ham slices and cheese among all the bottom half of the sliced rolls. Cover with the top half of roll. 4. Spoon the buttery mustard sauce over the tops of the sandwiches. Cover with foil and refrigerate until ready to bake. 5. Let sit overnight or at least one hour. 6. Pre-heated oven to 350°F. 7. Bake on the middle oven rack, covered for 10 minutes, remove foil, bake for an additional 5 minutes (total of 15 minutes baking time) until warmed through and the cheese is gooey and melty. Add an additional minute or 2 if needed. ---------------------------------------------------------------------------
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