Preheat oven to 350°F. Line a baking sheet with aluminum foil for easy clean up.
Place bottoms of rolls on the baking sheet. Spread marinara sauce evenly over rolls. Top with pepperoni slices, other desired toppings and mozzarella cheese.
Place tops back onto sliders.
Whisk together melted butter with garlic powder, Italian seasoning, black pepper and fine sea salt.