Pour in the beef or vegetable broth and toss in the sliced carrots along with the thyme, rosemary, salt, and pepper. Bring to a boil, then reduce the heat and let it simmer gently for about 90 minutes.
While the stew simmers, boil the diced potatoes in a separate pot until they’re fork-tender. Drain and mash them with milk, butter, salt, and pepper.
Once your stew is ready and your potatoes are mashed, ladle the steaming stew into bowls and top each serving with a scoop of mashed potatoes.
Notes
For a lighter version, try swapping half the potatoes for cauliflower. Pair with crusty bread for soaking up the gravy.