Preheat the oven to 350°F.
Pat the beef short ribs dry, season generously with salt and pepper.
In a heavy oven-safe pot or Dutch oven, sear the short ribs over medium-high heat until browned on all sides, approximately 2-3 minutes each side.
Reduce heat to medium-low, add a minced garlic clove and fresh thyme, stirring briefly to release aromas.
Cover the pot and transfer it to the preheated oven. Braise the short ribs for about 2 hours until tender and the meat easily pulls away from the bone.
While the short ribs are braising, prepare the roasted root vegetables: toss the carrots and parsnips in olive oil, salt, and pepper, then spread them out on a baking sheet.
About 30 minutes before the short ribs are done, roast the vegetables in the oven at 350°F for 25-30 minutes, or until they are tender and lightly caramelized.
Once both components are cooked, plate a portion consisting of approximately 5 ounces of short rib served alongside the roasted vegetables.
Garnish with an extra sprinkle of fresh thyme if desired and serve immediately.