Do you have anything in mind _____ you'd like to have for dinner?

[roseriver1012]

Do you have anything in mind _____ you'd like to have for dinner?
Should I use "what" or "that" for the blank? And better with your reasons. Thanks!

[areev]

Do you have anything in mind _____ you'd like to have for dinner?
Should I use "what" or "that" for the blank? And better with your reasons. Thanks!

(NOT A TEACHER)

maybe "whether"

[roseriver1012]

(NOT A TEACHER)

maybe "whether"

"whether" is kind of not right.

[Raymott]

Do you have anything in mind _____ you'd like to have for dinner?
Should I use "what" or "that" for the blank? And better with your reasons. Thanks!

You should use "that".

More commonly, this would be said as follows:
What would you like for dinner? Do you have anything in mind?

[roseriver1012]

You should use "that".

More commonly, this would be said as follows:
What would you like for dinner? Do you have anything in mind?

So do you mean that the sentence" Do you have anything in mind what you'd like to have for dinner?" is not correct in grammar or not usually said?
This is an exercise, and the answer given is "what". I have to explain it to my students.

[Raymott]

So do you mean that the sentence" Do you have anything in mind what you'd like to have for dinner?" is not correct in grammar or not usually said?
This is an exercise, and the answer given is "what". I have to explain it to my students.

That sentence is not correct. The answer is wrong.
You could say:
"Do you have anything in mind about what you'd like to have for dinner?"
"Do you have anything in mind concerning what you'd like to have for dinner?"
The grammar is different in these sentences. In the original, 'that' is a relative pronoun, referring to 'anything' - "Do you have in mind anything that you'd like for dinner?"
In the above two sentences "what" means "that which" - "Do you have anything in mind about that which you'd like for dinner?"
Here, 'which' is the relative pronoun, referring to 'that'. But this is not a common usage, especially colloquially.

Here is a better example:
"That which doesn't destroy you makes you stronger" = "Whatever doesn't destroy you makes you stronger."

[tedtmc]

Do you have anything in mind _____ you'd like to have for dinner?

anything what you'd like
anything about what/concerning what you'd like

Take out the 'in mind' and the lst phrase is obviously wrong.

With spoken English, shorter sentences is the way to go.

not a teacher