Preheat the oven to 350°F (175°C).

Slice the slider buns in half horizontally, keeping the bottom and top halves intact.

Place the bottom halves of the slider buns in a greased 9x13-inch baking dish.

Spread the marinara sauce evenly over the bottom halves of the buns.

Layer the halal turkey pastrami, beef mortadella, and chicken deli meat evenly over the buns.

Add slices of provolone cheese on top of the deli meats, followed by the shredded mozzarella cheese.

Sprinkle the banana peppers and black olives evenly over the cheese.

Place the top halves of the slider buns over the assembled ingredients.

In a small bowl, mix the melted butter, garlic powder, Italian seasoning, and olive oil.

Brush the butter mixture evenly over the tops of the slider buns.

Cover the baking dish with aluminum foil and bake in the preheated oven for 15 minutes.

Remove the foil and bake for an additional 5 minutes, or until the tops are golden brown and the cheese is melted.

Let the sliders cool for 5 minutes before serving. Cut into individual pieces and enjoy!