1. Ok, I'll cook some dishes we like for you.

2. What would you like to eat? I can make some for you.

No problem, I will cook something delicious to make your colleagues envy you.

If you don't want to cook, you can tell her:

1. Sorry, I don't want to cook today. We can go out to eat together or order takeout.

I don't want to cook. We can go to some good takeout shops, or you can bring your own food.

No matter what kind of reply you choose, you should respect the girl's wishes and express your thoughts and attitudes, so that the girl can know your thoughts and make your relationship more frank and true.