To give you an idea my two Syrians have the below in their treats draw. I give them a tiny bit (finger nail sized) of one of the treats each evening. They also have a bit of veg about 3 times a week.Meal worms, millet spray, dog biscuits (check there's no onion in the recipe) small amount of dried fruit, monkey nuts in shell, shop bought naturals range seed bars. Naturals treat log.
There are huge lists on here that tell you what you can and can't feed your hamster. Check that out too. And remember to introduce new foods slowly.
Hope this helps