Heat oven to 180°C, top and bottom heat only.
Heat oil in French oven (I used 26cm Le Creuset Buffet) over medium-high heat.
Season chicken with salt and pepper.
Add to pan and cook without touching for about 5-7 minutes. The skin will release from the pan when it's golden and ready.
Flip and cook for another 5-7 minutes until golden brown.
Remove from pan, and set aside.
Drain oil, leaving behind about 1-2 tbsp.
Over medium high heat, add garlic to pot
Cook until browned in spots, about 6 minutes.
Then, add chicken stock to cook while scraping the bottom brown bits of the pot and bring to boil.
Add thyme to the garlic and chicken stock.
Transfer chicken back into the pan.
Cover, and bake until chicken is tender, 20-25 minutes.
Remove chicken from the pan, and pour in thickener to make a gravy, stirring constantly over medium heat until thicken.
Garnish with thyme.