In a large mixing bowl, cream together butter, granulated sugar, and brown sugar until light and fluffy, about 3-5 minutes.

Add eggs one at a time, along with vanilla extract, mixing well after each addition.

In a separate bowl, whisk together flour, baking powder, and baking soda.

Gradually add the dry mixture to the wet ingredients, then fold in chocolate chips.

Cover the dough and refrigerate for 30-60 minutes.

Preheat oven to 350°F (175°C). Use a cookie scoop to form balls and bake for 12-15 minutes.

Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.

In a mixing bowl, beat together butter and shortening then gradually add powdered sugar and hot water until smooth.

To assemble, pipe frosting onto one cookie, top with another, and enjoy.