Can't get beardie to eat his veggies...

[gizmo17]

well gizmo is about 1 year old altho he doesn't look it...he's just smaller for some reason but ive been trying to fatten him up! and its been working he devours superworms like no tomorrow but when it comes to veggies he won't eat them! i tried putting the superworms in the veggies and he picks them out and walks away at 1 year he should be mainly veggies and less bugs but im afraid if i don't give him bugs he won't eat at all!