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Cook the Spaghetti:
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with olive oil.
Bring a large pot of salted water to a boil. Cook the spaghetti according to the package instructions until al dente. Drain and set aside.
Prepare the Meat Sauce:
In a large skillet, heat olive oil over medium heat. Add the chopped onion and cook until softened, about 5 minutes.
Add the ground beef or Italian sausage to the skillet. Cook, breaking it up with a spoon, until browned and cooked through.
Add the minced garlic and cook for another minute until fragrant.
Pour in the marinara or spaghetti sauce, then stir in the oregano, basil, salt, and pepper. Let the sauce simmer for 10 minutes, allowing the flavors to meld.
Assemble the Dish:
In the prepared baking dish, spread a thin layer of the meat sauce on the bottom.
Add half of the cooked spaghetti, spreading it evenly. Top with half of the remaining meat sauce, followed by half of the mozzarella and Parmesan cheese.
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