Wrap the bread in a damp (not soaking) towel, place on a baking sheet, and pop it in the oven for 5-10 minutes. In the microwave: Wrap the bread in a damp (not soaking) towel, place it on a microwave-safe dish, and microwave on high for 10 seconds. Check and repeat if necessary.
Moisten the baguette with an ice cube or cold, running water, making a quick pass under the water so the bread is moist but not soaked.
Wrap the baguette with aluminum foil, tightly sealing all seams to trap in steam.
Set the foil-wrapped baguette on your oven's center rack. Set the temperature to 300 degrees Fahrenheit. Do not place the loaf on a pan and do not preheat the oven.