Preheat your oven to 350 degrees F. Line the bottom of a broiling pan with foil and set aside.
Heat the olive oil in a large skillet over medium heat. Add the red onion, carrots, bell pepper, green onions, and garlic.
Cook, stirring occasionally for 5 minutes. Cover and cook for another 5 minutes, or until the carrots are soft.
Mix in 1/3 cup ketchup, Worcestershire sauce, black pepper, crushed red pepper, 1/2 teaspoon salt, and dried parsley. Remove from heat and let cool slightly.
In a large bowl, combine the ground beef, sweet Italian sausage, eggs, breadcrumbs, cooked vegetables, and the remaining 1/4 teaspoon salt.
Gently mix together the ingredients until combined.
Pour the mixture onto the broiling pan and shape it into a loaf. Brush the remaining 1/3 cup of ketchup over the tops and sides of the meatloaf.
Bake meatloaf for 1 hour.
Remove the meatloaf from the oven and let rest for 10 minutes prior to slicing.