You heard of cereal with peanut butter flavor. How about peanut butter with cereal? Now you can buy peanut butter with such flavors as fruity crisps, cocoa puffed rice and cinnamon crisps. The Peanut Principle!, a New York, company wants you to think outside the box and put cereal in a jar with peanut butter. It’s like having two meals at the same time. Cereal with a sandwich.