Creating Halloween Spaghetti is straightforward. Just follow these steps to bring this frightfully delicious dish to life:

1. Cook the Spaghetti: Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and set aside.
2. Prepare the Sauce: In a large skillet, heat the olive oil over medium heat. Add the chopped onion and minced garlic. Sauté until fragrant and soft.
3. Add Tomatoes: Pour in the crushed tomatoes. Stir in the dried basil, oregano, and red pepper flakes (if using). Season with salt and pepper. Allow the sauce to simmer for about 20 minutes.
4. Combine Pasta and Sauce: Once the sauce thickens, add the drained spaghetti to the skillet. Toss until the pasta is well coated in the sauce.
5. Add Cheese: If desired, sprinkle the shredded mozzarella cheese over the pasta. Cover the skillet briefly until the cheese melts.
6. Prepare for Serving: Remove the skillet from heat. Use tongs to transfer the spaghetti to serving plates.
7. Garnish: Top the pasta with sliced black olives for an eerie look. Scatter fresh parsley or basil leaves for a pop of color.

Your Halloween Spaghetti is now ready to be enjoyed!