Preheat the oven to 375°.
In a small bowl whisk together the butter, garlic powder, onions powder, basil and oregano until combined. Set aside.
Place the bottom buns in an oven safe pan and evenly spread on the shredded mozzarella.
Spread on the crushed tomatoes and then top off with pepperoni, sliced mozzarella and fresh basil leaves. Add on the top buns.
Brush on the melted butter mixture, cover with foil and bake for 20 to 25 minutes or until the cheese is melted.