Chocolate Drop Cookies with Cocoa Frosting

Ingredients

• 1/2 cup butter, softened
• 1 cup packed brown sugar
• 1 large egg
• 1/2 cup milk
• 1 teaspoon vanilla extract
• 2 ounces unsweetened chocolate, melted and cooled
• 1-2/3 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup chopped walnuts
• FROSTING:
• 2 cups confectioners' sugar
• 1/4 cup baking cocoa
• 1/4 cup butter, softened
• 1/4 cup hot strong brewed coffee
• 3/4 teaspoon vanilla extract