How should I answer "what are you thinking about?"

Anonymous
"What are you thinking about?"

I never know how to answer this question. I always freeze up.

I was hanging out with a girl last night that asked me and I thought quick and responded with "I'm just thinking about you". Then she wanted me to elaborate; "what are you thinking about me?".

I froze up again. What should I be saying?
How should I answer "what are you thinking about?"
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