Prepare the veggies by dicing the onion and pepper and mincing the garlic cloves.
Heat a skillet over medium heat and add the olive oil, ground beef, and veggies, and 1 teaspoon of salt.
Sauté until the meat is fully browned and the veggies are soft. (about 7-10 min)
Drain the grease from the meat/veggie mixture and return everything to the pan.
Add in the spaghetti sauce, drained diced tomatoes, tomato paste, and another 1/2 teaspoon of salt, garlic powder, and Italian seasoning.
Stir everything together, cover, and simmer for 20 minutes.
After the 20 minutes add in the parmesan cheese. Stir until melted.
Serve over pasta or let cool and refrigerate until ready to use.