Preheat the oven to 350 degrees F. Remove the rolls from the package and cut them in half horizontally, creating a top half and a bottom half. (This is easiest if you don't separate them.) Set aside.
In a medium saucepan, melt 1 ½ tablespoons of butter over medium-low heat. Whisk in the flour to make a roux and cook for 2 minutes, stirring frequently. Whisk in the heavy cream a little at a time (to prevent lumps). Turn the heat up to medium and cook until the cream begins to simmer, about 2-3 minutes, whisking frequently. Remove from the heat and slowly whisk in Pecorino-Romano cheese, nutmeg, salt, and pepper. Set aside.
Add the minced garlic and the remaining ¼ cup of butter to a small saucepan. Place over medium heat and cook until the butter is melted.
Place the bottom half of the rolls onto an ungreased 9-inch x 13-inch baking dish and brush with half of the melted garlic butter. Arrange the turkey slices evenly over the rolls. Arrange the tomato slices so there is one on each roll. Pour half of the cheese sauce over the tomatos and then top with bacon. Put the roll tops over the filling and brush the remaining garlic butter over the tops.
Cover the dish with foil and bake for 10 minutes. Remove the foil and sprinkle the tops with additional pecorino romano. Bake for 2 more minutes.
Remove from the oven. Garnish with chopped parsley and cut into individual sliders. Serve warm with a bowl of the remaining cheese sauce for dipping.
Notes
Nutritional information is for 1 slider with 1 tablespoon of additional sauce.