I must admit that I am a hot fudge brownie sundae (and I usually could care less for the ice cream) junkie.

You may want to plan it as a CAD day. I have had limited success not gaining this way. Although it has slowed my losses.

You eat 2 lc meals that day and a reward meal (this is whatever you want it to be) but eaten within one hour.

A couple of important notes: if you have any coffee/tea that day drink it within 15 minutes and also no artificial sweetners unless as part of your reward meal.

This keeps your insulin from spiking and then get right back on plan.

Up to you but a thoughtful way of cheating.