Preheat oven to 325F degrees.
In a large bowl, add cubed beef, salt, garlic powder, pepper and flour toss until combined.
Heat a large dutch oven over medium-high. Add 3 tablespoon olive oil to coat the bottom of the pot. Add half the beef and cook until browned on most sides. Remove from the pot and repeat for the second batch of beef.
Once all beef is browned and removed, add the remaining olive oil and drop the heat down to medium-low before adding onion, garlic, carrots, celery, and potatoes.
Add ½ cup of the beef stock and use a wooden spatula or spoon to deglaze the bottom of the pan. Make sure to scrape up any bits that are stuck to avoid burning in the oven.
Now add the onion soup mix packet and the ketchup and cook down for 5 minutes or until they start to caramelize onto the vegetables.
Now add the browned beef back in followed by the rest of the bone broth. Bring to a boil over high heat, put the lid on and place in the oven for 2 hours.
Once the 2 hours is up, whisk together cornstach and water to create a slurry. Remove the lid and stir in the slurry. Let it bubble and thicken for a few minutes - turning the burner to medium if needed.
Season with salt and pepper to taste then finish with a sprinkle of fresh chopped parsley.