I have made "Cake-In-A-Jar" and sent in care packages to the troops. Always get great reviews. Google cake in a jar, there are hundreds of recipes. Yes, you bake and seal them in a mason jar. I try and get those can cozies thru out the year and wrap them around the cake first, then anything else in the box that's going, then stuff hard candies into every crook and cranny so nothing can move. Of course I always ship in the military Flat Rate boxes from the Post Office. It's amazing how much I can get in there. My heaviest was 33 pounds!!