Preheat oven to 450°F and line a baking sheet with parchment paper or a silicone baking mat.
Chop potatoes into 1-2" pieces and place on the prepared pan. Drizzle with 2 Tablespoons of olive oil, toss to coat, and then season with salt and pepper to your preference.
Roast the potatoes for 25-30 minutes, turning halfway through, as you prepare the stew.
Place remaining oil in a stockpot or dutch oven over medium heat. Once oil is hot, add the ground beef and season with salt and pepper.
Cook until ground beef is well-browned (about 4 minutes or so) then add the diced onions, carrots and celery to the pot. Continue cooking for about 4 more minutes, until the onions are soft.
Stir in the garlic and cook 1 minute, then stir in the flour and thyme. Stir well, cooking for a couple more minutes, so that the flour coats all the meat and vegetables.
Pour in the beef broth and add Worcestershire sauce. Increase heat and bring the stew to a boil.
Once boiling, reduce heat to medium-low and cook for 10 more minutes, until stew thickens and vegetables become tender. Stir in roasted potatoes and season to taste.
Notes
Nutrition information provided as an estimate only. Your actual values may vary based on exact ingredients used and serving size.