Slice the slider buns in half horizontally, creating a top and bottom half.
Place a slice of cheese on each bottom half of the slider buns, creating the first layer of cheese.
Spoon pizza sauce evenly over the cheese layer on each slider bun.
Add another slice of cheese on top of the pizza sauce, creating a second layer of cheese.
Arrange pepperoni slices over the second layer of cheese on each slider bun.
Sprinkle additional grated or shredded mozzarella cheese on top of the pepperoni, ensuring a cheesy and flavorful finish.
In a small bowl, melt the unsalted butter. Add minced garlic, salt, and finely chopped fresh parsley(or dried parsley) to the melted butter and mix well. Brush the butter, garlic, salt, and parsley mixture generously over the tops of the slider buns.
Cover the prepared sliders with aluminum foil, ensuring the foil doesn't touch the cheese directly.
Place the wrapped sliders in the preheated oven for 10 minutes, allowing the cheese to melt and the flavors to meld.
Remove from the oven, uncover, and serve the pepperoni pizza sliders warm.