01 -
Heat oven to 350°F (175°C). Lightly grease a baking dish or rimmed baking sheet with cooking spray or oil.
02 -
Slice the slider buns horizontally as a single slab (keeping them connected). Place the bottom half in the prepared baking dish.
03 -
Spread marinara sauce evenly over the bottom layer of buns. Layer with half the mozzarella, all the pepperoni slices, then the remaining mozzarella. Place the top half of the buns over the fillings.
04 -
In a small bowl, mix melted butter, garlic powder, dried oregano, and red pepper flakes (if using). Brush this mixture generously over the tops of the buns.
05 -
Cover the dish with foil and bake about 15 minutes until cheese is melted. Remove foil and bake 5 more minutes until tops are golden and slightly crispy.
06 -
Sprinkle with Parmesan cheese and fresh basil. Let cool slightly, cut into individual sliders, and serve with extra marinara for dipping.