Sweet Potato and Ground Chicken Shepherd's Pie

Ingredients
2 tbsp olive oil
1-2 lb ground chicken or turkey
1 medium chopped onion
3-4 cloves garlic (minced)
2 tsp thyme
2 tsp poultry seasoning
1 cup chopped celery
1 cup chopped carrot
1/2 cup flour (or more depending on how much gravy you want to make)
1-2 cups chicken stock (again, depending on how much gravy you want)
4 large sweet potatoes
2 tbsp butter
pinch salt and pepper to taste
1 cup grated old cdn. Cheddar

Preparation:
Peel and boil sweet potatoes until tender. Meanwhile, heat olive oil over medium heat and saute onion and 1-2 minced garlic for about 3-5 minutes (until translucent) Add the ground chicken or turkey and cook for 5 minutes before adding the carrots and celery. Cook unti the meat is browned.
Stir in poulty seasoning, thyme, salt and pepper. Add flour and cook for one minute. Add stock and simmer until thickened to a gravy.
Pour into a glass baking dish. When the sweet potatoes are done, mash them with butter and 2 cloves of garlic. Spread the mashed sweet potatoes over the meat mixture. Top with grated cheddar cheese. Bake at 350ºF for 30 minutes.