Slow Cooker Fudgy S’more Cake Made this for a cook-out last weekend. It was a big hit and so easy. I had to cook it for 2hrs and 45 mins but it came out really moist and cake like. This could be because my crock is more bowl shaped. I added an extra cup of marshmallows 3 cups total, and when people were saying it could have used a little more I sprinkled more on when serving and it was perfect. Will be making again and again.