Preheat oven to 350. Cut rolls in half and place the bottoms in a 9x13 baking dish (I recommend putting foil in it). Put 1-2 slices of ham on each bun, and then put the cheese (I cut the cheese into 4ths and put 2 of those on each sandwich). Melt butter and add worcestershire sauce and dijon mustard and wisk until blended, then add onion flakes. Pour a spoonful of butter mixture over each sandwich and replace the top bun. Pour the remaining mixture over the top of the buns. Bake for 15 minutes. Can be made a few hours ahead (the recipe I used said they are even better when they are allowed to sit for several hours before baking)
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