Beat the mixture thoroughly to make sure that all the butter is [incorporated / *included] into the batter. Don't forget to [include / *incorporate] me on your Christmas card list!
Beat the mixture thoroughly to make sure that all the butter is [incorporated / *included] into the batter. Don't forget to [include / *incorporate] me on your Christmas card list!
The * means that the word is incorrect in the context shown.
In the first case, the butter is already in the batter. It is already included. That just means it's there