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Nugget or pellet type diets really aren't suitable, you need a good mix with seeds & other foods so they can forage properly & have plenty of variety. Some people in the UK use Harry Hamster or the Rodipet foods are another good option.
You can give some kind of treat daily as long as it's not too much, any soft foods like porridge should be a rare treat for healthy hams & are mostly fed to older or unwell hams.