• Preheat the oven to 350°F (175°C) and spray a 9x13 inch baking dish with non-stick cooking spray.
  • Cook the pasta according to package directions. Drain and return the cooked pasta to the pot. Pour an entire jar of tomato sauce over the pasta, add 1 teaspoon of garlic salt and stir to coat.
  • Heat olive oil in a large skillet over medium heat. Add the chopped green pepper, onion, and mushrooms. Season with a pinch of salt and sauté for 5-10 minutes, or until the onions are softened and the vegetables are slightly tender.
  • Add the ground beef to the skillet and cook over medium heat, stirring frequently, until browned. Drain any excess fat.
  • Add ½ jar of pasta sauce to the meat mixture and stir to combine. Then stir in the pepperoni, Parmesan cheese, and olives.
  • Add the shredded Parmesan cheese and stir to incorporate.
  • Spread the cooked pasta mixture evenly across the bottom of the prepared baking dish.
  • Spread the meat mixture evenly over the pasta layer.
  • Pour the remaining half jar of pasta sauce over the top of the meat mixture and spread.
  • Sprinkle the shredded mozzarella cheese evenly across the top.
  • Arrange the pepperoni slices, a sprinkle of chopped green peppers, sliced olives, and sliced mushrooms over the cheese.
  • Bake for 25-30 minutes, or until the cheese is melted and bubbly.