Root Beer Float Cookies

Ingredients (12)

• 1/2 cup butter, softened
• 1 cup packed brown sugar
• 1 large egg
• 1 teaspoon root beer concentrate
• 1-3/4 cups all-purpose flour
• 1/2 teaspoon salt
• 1/2 teaspoon baking soda
• FILLING:
• 1/4 cup butter, softened
• 1-1/3 cups confectioners' sugar
• 1 teaspoon water
• 1 teaspoon root beer concentrate