I saw this idea somewhere on the web and immediately became fascinated with the ideas of being able to bake these little cake directly in their jars and then be able to store or freeze them as little individual treats for...whenever! So, I did just that. I practiced first with a store bought box cake. I put together then mix, poured about a 1 cup into each jar and baked them on a baking sheet at 350 degrees for about 20 minutes. While the cakes were in the oven, I boiled the lids so they would be ready when the cakes came out of the oven. As soon as the cakes were out, I sealed them with the hot lids. You can hear them making a 'ping' sound as they cool down and seal. Soon, I was obsessed and my kitchen became a cake-in-a-jar sweat shop. Gingerbread, pumpkin, cinnamon swirl, and chocolate cake everywhere...so they became Christmas gifts for everyone we knew. A four pack of delicious single serving cakes you can take directly our of your pantry or freezer, warm in the microwave and eat directly from the cute little jar with a fork. So fun...and yummy!