Here's how Heidi adjusted the serving size of her son's snack cookie:
My 2.5 year old has suddenly become a cookie fiend. I don't mind letting him have one once in a while as a special treat, but his opinion on how often he should have a cookie is vastly different than mine. It doesn't help that my son gets his cookie monstering tendencies from my husband, so we always have cookies in the house.
Now, instead of giving him a whole cookie at snack time, I keep a box of Cookie Crisp cereal in the house. I can give him 1-2 "cookies", and he's in heaven. He's also back to eating healthy things like apples and bananas as snacks because he's not constantly whining for a cookie.
It's a pretty simple hack, but it's cut the whining in my house by half. Thought I'd share.