"These big chocolate and walnut chocolate chip cookies have a center filled with miniature marshmallows. The end result is a cookie marbled with chocolate and melted marshmallows. Lining the baking sheet with parchment paper makes these cookies easy to remove...."
INGREDIENTS
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1/3 cup all-purpose flour
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1/2 teaspoon baking powder
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1/8 teaspoon salt
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2 cups (12 ounces) semisweet chocolate chips, divided in half
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2 tablespoons unsalted butter
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1/2 cup sugar
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1 large egg
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1/2 teaspoon instant coffee powder dissolved in 1 teaspoon water