If you don't have a chef's torch you can broil the tops of your creme brûlée. Place the ramekins (approx. 2 at a time) on a baking sheet. Arrange the rack in the oven to the highest position and broil for approx. 5 minutes. Watch carefully and if possible rotate the ramekins with tongs to evenly broil the tops. A chef's torch is faster, safer and easier. You can buy a cheap one online (just don't forget to buy the fuel for the torch too).