Make Richer Rice Krispie Treats With One Invisible Canned Ingredient - Chowhound

dragosrrusu2/Shutterstock The best Rice Krispies Treats are gooey and delicious, with strings of melted marshmallow that slowly stretch with each bite you take. When eaten fresh, you'll have no problem biting into that tasty marshmallow square, but wait a couple of days and it's likely to have hardened into a stale, unsavory block. Luckily, there's a simple tip for keeping your treats soft for days — simply add…