Creating these Hot Italian Sub Sliders is a straightforward process that anyone can follow. Just follow these steps for a delicious outcome:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Dish: Lightly grease a baking dish or line it with parchment paper.
3. Slice the Rolls: Cut the slider rolls in half horizontally. Place the bottom halves in the baking dish.
4. Layer Meats: Begin layering the sliced pepperoni, salami, and ham evenly over the bottom half of the rolls.
5. Add Cheese: Sprinkle the shredded provolone cheese and grated Parmesan generously over the meats.
6. Top with Vegetables: Add diced green bell pepper, red onion, and sliced olives evenly on top of the cheese.
7. Season: Sprinkle Italian seasoning over the layers for extra flavor.
8. Complete the Sandwich: Place the top halves of the rolls on the loaded bottom halves.
9. Brush with Butter: Mix melted butter with olive oil and brush it over the top of the sandwiches to add richness.
10. Bake: Cover the baking dish with aluminum foil and bake for 15 minutes. Then, remove the foil and continue baking for an additional 5-10 minutes or until the cheese is bubbly and the tops are golden.
11. Garnish: Once out of the oven, sprinkle chopped fresh parsley on top for a pop of color and flavor.
12. Slice and Serve: Cut the sliders into individual portions and serve warm.

These straightforward steps will help you create the most delicious Hot Italian Sub Sliders that will leave everyone raving about their amazing taste.