Preheat your oven to 375°F (190°C).
Slice the slider buns in half horizontally.
Place the bottom halves of the buns on a baking sheet.
Spread a layer of marinara sauce over the buns.
Sprinkle half of the mozzarella cheese on top.
Evenly distribute pepperoni and cooked sausage over the cheese.
Add the remaining mozzarella cheese on top of the meats.
Place the top halves of the buns over the cheese.
Brush the tops of the buns with olive oil and sprinkle with Italian seasoning.
Bake in the oven for 20 minutes or until golden brown and cheese is melted.