they do need insects as part of their diet but bearded dragons also eat a variety of veggies
this website has a list of veggies and fruits that they can eat -->http://www.thebeardeddragon.org/what-do-bearded-dragons-eat.php
How old is your dragon? The more variety you can add to the diet, the better, but the ratio of bugs to veges changes depending on their age & size. What are you currently offering?
In a pinch but my bearded dragons eat various kinds of baby food. They particularly care for the veggie fruit varieties but they have been known to eat chicken and rice baby food as well.
I bought some monoject syringes from an online company. My female when I show her the syringe gets excited and runs up to it. I usually feed them until they stop eating. So the amount can vary from day to day.