Preheat the oven to 350 degrees and lightly grease a 9x13 inch baking dish.
Prepare the 12 Hawaiian rolls by slicing them in half horizontally. (see notes) Place the bottom half of the rolls in the baking dish.
In a mixing bowl, whisk together 12 large eggs, 1/4 cup heavy cream or half and half, 1/2 teaspoon salt and 1/4 teaspoon pepper.
Melt 13 tablespoons unsalted butter, divided in a skillet over medium-low heat.
Pour the eggs in the pan, and use a spatula to move the eggs around (scramble) while they cook. Stir them continuously, until they are mostly cooked. Remove from heat.
Spoon the eggs in an even layer over the rolls in the baking dish. Add the slices of 6 slices Cheddar cheese (or cheese of your choice) on top of the eggs. Finish by laying the pieces of 8 slices cooked bacon, broken in halves or thirds on top of the cheese.
Place the other half of the rolls on top.
In a measuring cup, melt the stick of butter in the microwave in 20 second increments.
Once it’s melted, add the 1/2 teaspoon garlic powder, 1/2 teaspoon dried onion flakes, 1 teaspoon Worcestershire sauce, 1 tablespoon Dijon mustard and 1/2 tablespoon poppy seeds. Stir until combined.
Pour the sauce over the top of the sliders covering it well. Cover the dish with foil and bake for 20 minutes or until the cheese is melted.
Remove from the oven, garnish with parsley (optional garnish) and 1/2 tablespoon sesame seeds if desired and serve immediately.
Notes
The easiest way to slice the rolls is to use a large serrated knife. Since the rolls are already stuck together, place them on a cutting board. Starting at one end, place the knife halfway down the buns and gently slice horizontally, moving to the opposite end.To avoid overcooking the eggs, turn the heat down or off as soon as they start to firm up. You want to slightly undercook them because they will be going into the oven and will continue to cook there.