Preheat oven to 350°F. Line a baking sheet with aluminum foil for easy clean up.
Place bottoms of the cut 12 slider rolls on the baking sheet. Spread the 1/2 cup marinara sauce evenly over rolls. Top with the 1/2 cup sliced pepperoni, other desired toppings and shredded 1 cup low moisture mozzarella cheese.
Place the tops back onto sliders.
Whisk together the melted 4 tablespoons unsalted butter with 1 teaspoon garlic powder, 1 teaspoon homemade Italian seasoning, 1/4 teaspoon black pepper and 1/4 teaspoon coarse kosher salt.
Baste the butter mixture over the tops of the slider rolls.
Bake, uncovered, for 7-10 minutes.
Remove and serve immediately.
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