In a large pan saute your veggies.

Remove and brown and drain the beef, adding the veggies back in after draining along with the pepperoni.

Meanwhile, in a small pot, warm the tomato sauce, and toast your buns.

When buns are toasted, spread butter, dust with garlic powder and parsley, and also some grated parmesan if you like.

Put a spoonful of beef mixture on bun, spoon over a bit of sauce, cover with mozzarella, and add the top bun.

Your stromboli is ready to eat.