INGREDIENTS
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1/2 cup (1 stick) unsalted butter, cut into cubes
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3 ounces unsweetened chocolate, chopped
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1-1/2 cup sugar
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3 large eggs
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2 teaspoons instant espresso powder
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1 teaspoon pure vanilla extract
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1/4 teaspoon salt
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3/4 cup flour
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1/4 cup Walnuts (optional)
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2 ounces semi sweet chocolate chopped or chocolate chunks (optional)
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Espresso Swiss Meringue Buttercream (SMB)
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5 large egg whites
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1-1/4 cups sugar
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1-1/2 cups unsalted butter, cut into cubes, room temperature
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1/2 tablespoon pure vanilla extract
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2 teaspoons espresso powder
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2 teaspoons boiling water
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Pinch of salt