Old fashioned jelly roll
Box of cake mix - use pound cake box if making white cake with jelly inside or chocolate or devils food if making chocolate with cream filling.
Mix cake per directions on box, line a jelly roll sheet (cookie sheet with lips) with wax paper, grease and lightly flour. Spread cake mixture evenly and bake at 400 until done (somewhere between 8-15 minutes). Let cool completely and then flip onto aluminum foil. Fill with filling, layer of jam and/or whipped cream and then roll gently using aluminum foil to help. The top layer will come off on aluminum foil but that's okay...it's what you want. It may crack at first but by the end it shouldn't. Tighten and wrap. Put in fridge for an hour or so and then enjoy. :-)