You sure can! Most dips are great in the slow cooker because you can prep ahead of your event and they will stay nice and hot. Just combine everything through step 2 of the recipe (where you add the crab), but don't sprinkle the last bit of cheese on top. Cook it on LOW heat in the slow cooker for 3-4 hours until it is hot all the way through. When it's close to party time, just sprinkle the reserved cheese on top and let it melt.