You want the ice cream to be solid enough to not smoosh out the sides, but not too hard to scoop. Mine was in the freezer for about 3 hours. If using commercial ice cream, allow to sit on the counter until it can be scooped out.

Press down just enough to push the ice cream to the edges of the cookie. Place them in the freezer for about an hour to harden. I put them in the freezer uncovered, on a baking sheet like you see above. I would suggest putting parchment paper on the baking sheet, because you will need it later.

Ufo Ice Cream Sandwich Where To Buy