Step 1: Preheat the Oven

1. Preheat your oven to 350°F (175°C).

Step 2: Prepare the Dressing

1. In a small bowl, mix together mayonnaise, Italian dressing, garlic powder, oregano, and red pepper flakes. Set aside.

Step 3: Assemble the Sliders

1. Slice the slider buns in half horizontally, keeping them connected if possible.
2. Spread the dressing mixture evenly on the bottom half of the buns.
3. Layer the ham, salami, pepperoni, and provolone cheese on top.
4. Add banana peppers, black olives, shredded lettuce, and diced tomatoes.

Step 4: Add the Top Buns

1. Place the top half of the buns over the filling.

Step 5: Prepare the Topping

1. In a small bowl, mix melted butter, garlic powder, Italian seasoning, and Parmesan cheese. Brush this mixture generously over the top of the sliders.

Step 6: Bake the Sliders

1. Wrap the sliders in aluminum foil and bake for 15 minutes.
2. Remove the foil and bake for an additional 5-10 minutes, or until the tops are golden brown and the cheese is melted.

Step 7: Serve and Enjoy

1. Let the sliders cool for a few minutes, then slice them into individual portions and serve warm.