Preheat the oven to 350°F (175°C).
Bring a large pot of salted water to a boil, add the rotini and cook about 8 minutes until tender; drain and return to the pot.
In a large skillet over medium heat, cook the ground beef, breaking it up with a spoon, until no longer pink; drain excess fat.
Add the chopped onion, minced garlic, and chopped green bell pepper to the skillet and cook about 5 minutes until the vegetables are softened.
Stir in the tomato paste, diced tomatoes with juice, Worcestershire sauce, dried parsley, dried oregano, dry mustard powder, salt, and pepper; bring to a simmer.
Reduce heat to low and simmer the sauce about 15 minutes to blend the flavors.
Pour the tomato-beef mixture over the cooked pasta and stir until well combined.
Spray a 9x13-inch baking dish with cooking spray, transfer the pasta mixture to the dish, and sprinkle the grated cheddar evenly on top.
Bake for 20–25 minutes, until the cheese is melted and bubbly.
Remove from oven and top with chopped pickles, chopped fresh tomatoes, and chopped iceberg lettuce; serve with Thousand Island dressing.