How do you ask about favorite things in Korean?
I just learned about superlatives in Korean, but I'm not quite sure how to use that grammar to ask people about their favorite things. Is the following set-up correct?

Q: 제일/가장 좋아하는 ___은/는 뭐예요?
A: 제일/가장 좋아하는 ___은/는 ____ 이에요/예요.

Ex:
Q: 가장 좋아하는 과일은 뭐예요?
A: 가장 좋아하는 과일은 딸기예요.

Does this make sense? Or should I use a different set-up? Thank you for your help!!

Question

How do you ask about favorite things in Korean?
I just learned about superlatives in Korean, but I'm not quite sure how to use that grammar to ask people about their favorite things. Is the following set-up correct?

Q: 제일/가장 좋아하는 ___은/는 뭐예요?
A: 제일/가장 좋아하는 ___은/는 ____ 이에요/예요.

Ex:
Q: 가장 좋아하는 과일은 뭐예요?
A: 가장 좋아하는 과일은 딸기예요.

Does this make sense? Or should I use a different set-up? Thank you for your help!!

Answer

Q: 제일/가장 좋아하는 ___은/는 뭐예요?
A: 제일/가장 좋아하는 ___은/는 ____ 이에요/예요.

Ex:
Q: 가장 좋아하는 과일은 뭐예요?
A: 가장 좋아하는 과일은 딸기예요.

What you wrote is perfect :)

To discribe it more 
You can sometimes add this 
세상에서on the earth 가장 좋아하는 ___  뭐예요?
Or
Among ~중에 
과일 중에 가장 좋아하는 ____뭐예요?

For your information 
There is a slang "최애하는"
최고로 애정(사랑)하는 
___ that i most love

This song is my most favorite one 
이 노래 내가 최애하는 거야!

Answer

도와줘서 감사합니다, cheney님!! :)

Answer

I think the set-up is perfect😄  In addition to that, in spoken language, you can slightly change like,

과일 중에 뭘(무엇을) 제일 좋아해요? What's your favorite among fruits?
어떤 과일을 제일 좋아해요? Which fruit do you like the most?