i feed a brand called Bunny they have a few different mixes but i use the hamster dream vegetable mix for my syrian and the dwarf mix for my dwarfs its the best seed mix ive come across where my hamsters actually eat everything and they even add mealworms into the mix too
Bunny syrian mix:
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Bunny dwarf mix
https://www.ebay.co.uk/itm/114781353305
i used to feed harry hamster but half the bag would get wasted because the hammy's wouldnt eat the corn or the big dog biscuit looking things and those 2 things would be most of the bag so it seemed pointless getting it. not only do i feed the bunny mix but i also throw in the pets at home pellets or "nuggets" and they seem to love those too