Step 1: Identify the sentence for transformation.
The sentence to transform: "What makes you happy, my dear?"
Step 2: Transformation into Passive Voice.
To convert an active sentence into passive voice, we identify the subject and object, and change their places. The verb "makes" changes to "is made."
Passive Voice: "What is made you happy, my dear?"
Final Answer: \[ \boxed{\text{What is made you happy, my dear?}} \]
Let us organize a surprise party. (Convert the sentence into passive voice)