Verb
overbeat (third-person singular simple present overbeats, present participle overbeating, simple past overbeat, past participle overbeaten)
(transitive) To beat (eggs, cream, etc.) for too long, impairing the texture.
Be careful not to overbeat the mixture or it will set in the bowl yielding a crumbly mess rather than a creamy finished candy. Source: Internet
Fold the batter with a rubber spatula a few times to be sure it's completely blended, but don't overbeat the batter. Source: Internet