COOKIE DOUGH FILLING:
3/4 cup all-purpose flour
1/8 teaspoon baking soda
1/8 teaspoon salt
4 tablespoons (1/2 stick) unsalted butter, melted
1/4 cup packed brown sugar
2 tablespoons granulated white sugar
2 tablespoons milk
1 teaspoon vanilla extract
1/2 cup miniature chocolate chips

CUPCAKES:
1 cup all-purpose flour
1/2 cup unsweetened cocoa powder
1 cup granulated white sugar
1/2 teaspoon baking soda
1/4 teaspoon salt
3/4 cup hot water
1/2 cup vegetable or canola oil
1 large egg
1 1/2 teaspoons vanilla extract

COOKIE DOUGH FROSTING:
3/4 cup (1 1/2 sticks) salted butter
1 3/4 cups powdered sugar
1/3 cup packed brown sugar
1/2 cup all-purpose flour
1 1/2 tablespoons milk
1 teaspoon vanilla extract

GARNISH:
additional mini chocolate chips
12 mini Chips Ahoy cookies