Heat oil in a small pan and cook the lemongrass, garlic and shallot over medium heat until softened. Remove from heat and stir through the kaffir leaf and coriander. Cool for 10 minutes. Transfer the cooled lemongrass mixture to a bowl and squeeze juice from 1 lime stir through with the breadcrumbs.
Fill chicken cavity with stuffing, close with toothpicks or skewers. Tie drumsticks together and fold under wings. Place chicken on a roasting rack over a large baking dish. Thinly slice the remaining lime and place over chicken, sprinkle over chilli flakes. Bake in 190°C preheated oven for 1 hour and 45 minutes, or until cooked through. Serve with roasted chillies.