Boil a large pot of salted water and cook the spaghetti according to package instructions until al dente. Drain and set aside.

In a large skillet, heat 1-2 tablespoons of olive oil over medium heat. Add the chopped onion and diced bell pepper, sautéing until they are soft—about 5 minutes.

Toss in the minced garlic and continue cooking for an additional minute, being careful not to burn it.

Add the ground beef or turkey to the skillet. Using a spatula, break it apart as it cooks for about 6-8 minutes, or until fully browned.

Stir in the diced tomatoes and tomato sauce. Add Worcestershire sauce, Italian seasoning, salt, and pepper.

Let the sauce simmer for about 10 minutes until heated through and well blended.

Toss the drained spaghetti into the skillet with the sauce and mix until all the noodles are coated, allowing them to soak up the flavors.

Serve hot, garnished with fresh basil or parsley and topped with grated cheese if desired.