Cook the spaghetti according to package instructions. Once cooked, drain the water and set aside.
Heat a large skillet over medium-high heat. Add the ground beef and Italian sausage and cook for 5-7 minutes until browned. Drain excess grease.
Add the red bell pepper, green bell pepper, and onion. Continue to cook for 5-7 minutes until the vegetables are softened.
Add the garlic and cook for 1 more minute.
Sprinkle the flour over the skillet and stir everything together.
Add the tomato paste, Worcestershire sauce, Creole/Cajun seasoning, Italian seasoning, and beef and onion soup mix. Stir together.
Turn up the heat to high and pour in the beef broth 1 cup at a time, stirring between each cup. Continue to cook for approximately 3 minutes, until the mixture thickens.
Remove from the heat and add the spaghetti, thoroughly mixing it with the meat sauce.