Coq au vin with garlic croissant puffs

Name: Coq au vin with garlic croissant puffs
Ingredients: 2 tbsp olive oil; 3 medium onions, each cut into 6 or 8 wedges; 4 garlic cloves, sliced; 200g pack baby button mushroom; 200g pack smoked lardon; 12 skinless chicken thigh fillets, each cut into 3; 400ml red wine, such as Merlot; 300ml chicken stock; 1 tbsp brandy (optional); 2 tbsp tomato purée; 2 bay leaves; large thyme sprig; 1 tbsp soft butter; 2 tbsp plain flour; 25g soft butter; 2 garlic cloves, finely crushed; 2 tbsp chopped parsley; 1 tsp fresh thyme leaves; 250g pack croissant dough