I don't have any, but if i did i would feed them lots of crickets & woodies dusted with calcium and multivitamins. I would also be offering them banana, apple and strawberries.
I feed mine two types of food. the first is small crickets. It is also fun to watch them devour the odd big on that gets in. Secondly, I give them a finely chopped up mix of vegies and dog food.
I also give them two sessions of sunlight a week so that they get some real sun.