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Bring a large pot of water to a boil for the potatoes. Let this heat up while you cook the meat mixture.
In a large skillet, cook the onion, add garlic. Add beef or lamb and cook until browned. Drain off grease.
Add tomato sauce and vegetables. Cook for 4-5 minutes, stirring often.
Add Guinness, Worcestershire sauce, thyme and salt and pepper to taste. Boil until the liquid has reduced by half and thickened (about 15 minutes).
Add the potatoes to the boiling water and cook for 15-20 minutes or until soft but not mushy. Drain and cool. Mash the potatoes with the butter, milk, salt and pepper to taste.
Once meat mixture is done cooking and the potatoes are mashed, divide the meat mixture between two dishes. Top with mashed potatoes then with the cheese.
When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes). Set the temperature to 350 degrees F and preheat, lid closed, for 10 to 15 minutes.
Bake for 30-45 minutes or until potatoes are golden brown and cheese is melted. Serve hot. Enjoy!