Preheat the oven to 350 degrees F (175 degrees C). Line 2 to 3 baking sheets with parchment paper.

Cream butter, white sugar, and brown sugar together in a large bowl with an electric mixer. Add eggs, cooled coffee, and vanilla extract.

Whisk flour, baking soda, and salt together in a small bowl. Incorporate slowly into egg mixture. Fold in caramel bits and marshmallow pieces.

Drop dough by heaping teaspoonfuls onto the prepared baking sheets.

Bake in the preheated oven until golden brown, about 9 minutes.