01 - Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish.
02 - In a mixing bowl, whisk together the eggs, milk, salt, and pepper. Cook the egg mixture in a nonstick skillet over medium heat until just set. Remove from heat.
03 - Slice the slider rolls horizontally, keeping them connected, and place the bottom halves in the prepared baking dish. Distribute the scrambled eggs evenly over the roll bottoms. Layer the ham slices on top of the eggs, followed by the Swiss cheese slices.
04 - Place the top halves of the slider rolls over the cheese. In a small bowl, combine the melted butter, Dijon mustard, Worcestershire sauce, poppy seeds (if using), and minced onion (if using) to create the glaze. Generously brush this mixture over the tops of the assembled rolls.
05 - Cover the baking dish with aluminum foil and bake for 15 minutes. Remove the foil and continue baking for an additional 5 minutes, or until the tops are golden brown and the cheese is fully melted.
06 - Allow the sliders to cool for 5 minutes before slicing them apart and serving.