What can you give a Muslim for dessert?

Something delicious! I personally like fruit trifles with lots of cream.

You could offer me a virgin bride aswel.

Okay seriously, avoid Gelatin and other stuff that could have pig or alocohol.

Besides that I don't think there is any such things as 'the Muslim desert' or even 'a Muslim desert.

If you're still not sure just go buy or make something most normal people in the world enjoy for desert and you have nothing to worry about :)