Doctored up Spaghetti Sauce (from a jar)

Name: Doctored up Spaghetti Sauce (from a jar)
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: American, Italian
Ingredients: 2 tablespoons olive oil; 2 pounds ground beef ((or a mixture of beef and turkey)); 1 small yellow onion ((diced)); 1 small green bell pepper ((diced)); 1 teaspoon salt; 4 garlic cloves ((minced)); 1 teaspoon garlic powder; 1 teaspoon italian seasoning; 24 ounce jar of store-bought pasta sauce; 14.5 ounce can of petite diced tomatoes (drained); 2 tablespoons tomato paste; 1/4 cup parmesan cheese ((plus more for serving))