it depends on your beardies age

Juvenile:- should be fed as Meany cricket as they can in 10 mins
and then offered a mixed salad romaine spinach and mustard greens
are all good choices as they are high in calcium you can also give them
carrots green beans parsnips figs kiwifruit in small amounts to add for a more
appetizing meal but no more than 10% of the dish

Adults:- will eat more veg and less crickets as the get older

don't use crickets to large for them as it will cause digestive problems
crickets and salad should be no larger then the width of the dragons head

hope that help