Chocolate Marshmallow Cookie Recipe: S'mores Cookies

Ingredients

• 1/2 cup butter, softened
• 1 cup sugar
• 1 large egg, room temperature
• 1/4 cup 2% milk
• 1 teaspoon vanilla extract
• 1-3/4 cups all-purpose flour
• 1/3 cup baking cocoa
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 18 large marshmallows
• ICING:
• 6 tablespoons butter, softened
• 2 tablespoons baking cocoa
• 1-3/4 cups confectioners' sugar
• 1/2 teaspoon vanilla extract
• Pecan halves