Preheat oven to 350 degrees F.

Place the sugar cookie dough on an ungreased cookie sheet and bake for 10-12 minutes. Remove from the oven and allow the cookies to cool completely.

Stir the fluffy white frosting until smooth. Spoon frosting into a plastic zip-top baggie. Snip off the end of the bag and use it to pipe a frosting all over the back of one cookie. Place another cookie on top and squeeze until the frosting reaches the edge of the cookie sandwich.

Place the nonpareil sprinkles into a shallow bowl. Roll the edges of the sandwich cookies in the sprinkles.