Verb:
* Past tense of whisk: "She whisked the eggs until they were light and fluffy."
* Past participle of whisk: "The cake batter was whisked smooth."
Adjective:
* Describing something that has been whisked: "The whipped cream was a whisked delight."
To determine which part of speech it is, look at the sentence it's used in. If it describes an action, it's a verb. If it describes a quality, it's an adjective.