Preheat oven to 350 degrees F (175 degrees C).

Heat 1 tablespoon olive oil in a skillet over medium heat.

Add chopped red bell pepper, onion, and minced garlic to the skillet.

Sauté the vegetables until they are softened, about 5-7 minutes.

Remove the skillet from heat and allow the mixture to cool slightly.

In a large bowl, combine ground beef, sautéed vegetables, eggs, breadcrumbs, parmesan cheese, Worcestershire sauce, balsamic vinegar, chopped fresh basil, parsley, salt, and black pepper.

Mix all ingredients together until just combined. Be careful not to overmix.

Place the meatloaf mixture in a meatloaf pan or pie dish.

Pour marinara sauce evenly over the top of the meatloaf.

Bake in the preheated oven for 50-60 minutes, or until the meatloaf is cooked through.

Remove the meatloaf from the oven and let it stand for 10 minutes before slicing and serving.