Preheat oven to 350 degrees F (175 degrees C) and lightly grease a 2 quart baking dish.
In a large skillet over medium-high heat, stir and cook ground beef, onion and celery until juices run clear.Drain. Pour mixture into baking dish with vegetable soup and thyme; stir well. Spread mashed potatoes on top.
Bake 20 minutes.Sprinkle shredded cheese on top and bake 5 minutes more, or until cheese has melted.
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