Preheat oven to 325.
Line a 9x13 baking dish with foil (enough that it overlaps the sides - to use as handles)
Spray foil-lined baking dish with cooking spray.
Slice rolls horizontally as a unit – don’t break apart into individual rolls.
Put the bottoms into the baking dish.
Lay meat on top, then cover with cheese.
In a small bowl, whisk together sauce ingredients.
Pour 1/2 of the sauce on top of cheese.
Place tops of rolls on top, pressing down lightly.
Pour remaining mixture over tops of rolls and spread evenly.
Bake for 15-20 minutes.
Watch closely – if the tops begin to brown too much, place a sheet of foil over the top.
Remove from oven and let cool for about 10 minutes.
Using the foil "handles" lift the sandwiches out onto a cutting board.
With a large butcher knife, cut the sandwiches into their individual slider rolls.
Dust generously with powdered sugar and serve with raspberry preserves on the side.