Shepherd's Pie

Preheat oven to 350 degrees. Heat oil in a large skillet over medium heat. Cook onion in oil for 5 minutes, stirring frequently. Stir in the ground beef, thyme, and salt/pepper to taste. Cook and stir for 5 more minutes. Mix in the garlic, green beans, corn, Worcestershire sauce, and tomato soup, and simmer for 5 minutes. Prepare instant or home made mashed potatoes. Spread evenly over meat mixture, and cover with cheddar cheese. Place the skillet in a preheated oven for 15 to 20 minutes, or until potatoes start to brown on top and cheese is melted.