Keep Any Toasted Sandwich Crispy With This Easy Step - Tasting Table
Briefly

To maintain the crispiness of toasted bread in sandwiches, it is vital to let the bread cool on a wire rack for at least 30 seconds to a few minutes. This cooling period prevents condensation from forming when cold condiments are added. If a wire rack isn't available, one can simply tent the slices to allow cooling on both sides. For wrapping sandwiches for later, it’s crucial to let them cool completely to avoid sogginess. Techniques such as toasting one side of the bread can also contribute to keeping sandwiches crispy.
Letting toasted bread cool on a wire rack for 30 seconds to minutes prevents sogginess, allowing it to maintain its crunch when making sandwiches.
To prevent condensation, let the bread cool completely before wrapping it up; otherwise, cold condiments can ruin the toast's crispness.
Read at Tasting Table
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