INGREDIENTS
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2 tablespoons instant espresso powder
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2 teaspoons vanilla extract
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1 tablespoon water
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12 large egg whites, at room temperature
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1 teaspoon cream of tartar
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1 1/4 cups sugar
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1 cup cake flour
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1/2 teaspoon kosher salt
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1 cup mini chocolate chips
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1 cup semisweet chocolate chips
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1/2 cup milk (I used 1%)
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2 teaspoons instant espresso powder