Preheat the Oven: Begin by preheating your oven to 350°F (175°C). This ensures even cooking for the sliders. Line a baking dish with parchment paper to prevent sticking and make cleanup easy.
Prepare the Rolls: Take the Hawaiian rolls and, using a bread knife, slice them horizontally without separating the individual rolls. Keep the top and bottom halves intact for easier assembly. Place the bottom half in the lined baking dish, ensuring they fit snugly.
Layer the Ingredients: Spread a generous layer of seedy mustard over the bottom rolls, ensuring an even coating for added flavor. Next, place Havarti cheese slices on top of the mustard, covering the entire surface. Finally, evenly distribute the shredded or sliced brisket over the cheese layer, ensuring every roll gets a hearty portion.
Add the Top Rolls: Carefully place the top half of the rolls over the layered ingredients, aligning them precisely with the bottom half. This step ensures the sliders bake evenly and are easy to serve.
Prepare the Butter Glaze: In a small bowl, combine melted butter with minced garlic and freshly chopped parsley. Mix until well blended. Using a pastry brush, generously coat the tops of the rolls with the butter glaze, making sure to cover every inch for a golden, flavorful finish.
Bake: Cover the dish loosely with aluminum foil to prevent the tops from browning too quickly. Bake in the preheated oven for 10–12 minutes, allowing the cheese to melt thoroughly. Then, remove the foil and bake for an additional 3–5 minutes, or until the tops are beautifully golden and slightly crisp.
Serve: Once baked, let the sliders cool for a few minutes to set. Use a sharp knife to cut them into individual portions. Serve them warm to fully appreciate the rich flavors and satisfying textures in every bite!