Preheat oven to 350 degrees.Advertisement
Place bread cubes and salt in a food processor and process until coarse crumbs form. Spread crumbs on a rimmed baking sheet in a thin, even layer. Bake until golden brown, stirring, about 12 to 15 minutes.
Transfer baking sheet to a wire rack to cool. Keep frozen, in an airtight container, up to 3 months.