Yes! There are two ways that I recommend re-heating brussels sprouts:  In the microwave. This is the quickest and easiest way to reheat your sprouts. However, just be aware that they will not be crispy if reheated this way, but that will still taste amazing! In the oven. Broil the sprouts until they are warm and re-crisped. This only takes about 2-5 minutes so watch them closely and don't walk too far from the oven.