Start by preparing the stuffing. Cook bacon in a large fry pan over medium heat until it crisps. Add mushrooms, spring onions, parsley and thyme and sauté for 5 minutes. Pour wine into pan; simmer until wine evaporates, roughly 3 to 4 minutes. Remove from heat, discard thyme sprigs and stir in bread crumbs, season with salt and pepper and allow it to cool.