The chocolate chip dough is used twice here: in the cookies, which are layered with ganache, and in the ice cream filling.
Break cookie dough into chunks; stir into ice cream. Freeze until firm, about 3 1/2 hours.
Bring cream to a simmer in a saucepan over medium heat. Pour over chocolate in a bowl. Let stand for 1 minute. Whisk until smooth. Let stand, whisking often, until thick and spreadable, about 25 minutes.
Spread 2 teaspoons ganache onto 8 cookies. Scoop 1/4 cup ice cream onto remaining cookies. Sandwich cookies together. Freeze on a baking sheet for 30 minutes.
Food Safety Note: The egg in the cookie dough is not cooked.
Ice cream sandwiches can be frozen overnight.