For the cookie dough:
2 sticks softened butter
3/4 cup sugar
3/4 cup brown sugar
4 tablespoons milk
1 tablespoon vanilla
2 1/2 cups all purpose flour
1/4 tsp. salt
1 cup mini chocolate chips

For the cupcakes:
3 sticks softened butter
1 1/2 cups light brown sugar, packed
4 large eggs
2 2/3 cups all purpose flour
1 tsp. baking powder
1 tsp. baking soda
1/4 tsp. salt
1 cup milk
2 tsp. vanilla extract

For the frosting:
3 sticks softened butter
3/4 cup light brown sugar, packed
3 1/2 cups powdered sugar
1/2 tsp. salt
2 tablespoons milk
1 tsp. vanilla extract