In a small bowl, stir together butter, olive oil, Italian seasoning and garlic powder.
Place the bottom slider buns onto a baking sheet or dish. Lightly brush the buns with the butter mixture. Bake for 8 minutes until slightly toasted.
Remove the buns from the oven and top each bun with 2 slices of sandwich sized pepperoni. Layer with the Canadian bacon, and another layer of pepperoni.
Spoon 1 tablespoon of sauce on top of each slider. Then cover with the crumbled cooked sausage and sprinkle evenly with cheese.
Add the top of the slider buns and brush the remaining butter mixture over the top.
Return to the oven and bake for 12 minutes until the tops are toasted and the cheese is melted. Sprinkle with Parmesan cheese if desired, and serve.