Start by preheating the oven to 200 degrees Celsius. Then grease and line a baking tray with baking paper. Heat the oil in a frying pan over medium-high heat. Add the bacon and cook, stirring, for three to four minutes or until the bacon starts to brown. Add the leek and cook, stirring, for two to three minutes or until the leek softens.
Transfer the mixture to a plate lined with paper towel and set aside to cool slightly. Place the bacon mixture, cream cheese, sour cream, gruyere and garlic salt in a large bowl. Stir to combine. Using a large serrated knife, cut four centimetres from the top of the cob and reserve. Remove the bread from the centre of the cob, leaving a two centimetre thick shell.
Tear the bread from the center of the cob into three centimetre pieces. Spoon the cream cheese mixture into the bread shell and top with the reserved bread lid. Place on the lined tray and arrange the bread pieces around the cob. Spray with olive oil spray and pop in the oven for 20 minutes or until golden.
Transfer the cob to a serving platter and carefully remove the lid. Drizzle with oil and sprinkle with thyme leaves and serve with the toasted bread. With its creamy filling rippled with leek and bacon this cob will be a fan favourite.