My personal favorite is the one that has those M&M's in them. Especially when it is nice and soft.
It is a Chocolate Chip Oatmeal Cookie!
sugar
Everyday is cookie day, so go on and buy yourself your favorite kind.
The "regular" kind
Oreos are by far my favorite cookie.
Sadly, the cookie monsters favorite type of cookie is raisin.... I know it's horrible!... well not really because raisins help you fight off consipation and flush your insides so it's not so bad if a pupet's favorite type of cookie is oat-meal raisin.
Kelp cookie and his favorite drink is, Seahorse milk
Rudolph the Red-Nosed Reindeer is an imaginary character, so you can imagine his favorite cookie as anything you like... such as your own favorite cookie!
The slogan is Oreo. Milk's favorite cookie.
Sugar Cookie
The cookie monsters favorite season is beating off in a jar.
Oreo * for homemade i would say a Chocolate chip cookie is most Americans favorite cookie of choice.