Yes, you can usually stack two slices of bread in a toaster. Most standard household toasters are designed to accommodate two slices of bread side by side in the two slots. When you insert the slices, ensure that they are placed vertically and not overlapping each other.
However, it's essential to check your toaster's user manual to confirm if it's designed to handle two slices simultaneously. Some toasters may have limitations on how many slices can be toasted at once or may have specific instructions regarding stacking bread.
Additionally, stacking too many slices or placing other items in the toaster that aren't meant to be toasted (e.g., bagels, pastries, or anything metallic) can lead to uneven toasting or cause damage to the toaster. Always use the toaster according to the manufacturer's guidelines to ensure safe and efficient operation.