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Pour the batter into the greased and parchment paper-lined loaf pan.
Bake for 55-65 minutes, or until a toothpick inserted near the center comes out clean.
Cool for 20 minutes before removing from pan; peel off parchment and put on a wire rack to cool completely.
To Make the Coffee Glaze
Combine the hot water with the dry espresso and stir until blended.
In a small bowl, whisk together the powdered sugar, melted butter, vanilla, and espresso. If it needs to be thinner, add 1/2 tsp of hot water at a time to get desired consistency.
Drizzle the Espresso glaze over the cooled bread and scatter the chopped walnuts on top. Let cool until the glaze sets before cutting.
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