Preheat the oven to 300°F to 350°F
Wrap the bread in foil
Place the wrapped bread in the oven for 10 to 15 minutes
For a crustier loaf, unwrap the bread for the last 2 to 5 minutes
For slices, warm them in a toaster or toaster oven
For a microwave, wrap the bread in a damp paper towel and heat for 10 to 20 seconds
Check frequently to avoid drying out the bread