From what I understand, butternut squash is quite good from beardies. I was wondering if I can feed my beardie butternut squash pasta (without any sauce obviously).
If it's pure butternut squash, sure. Check the ingredients though to make sure there isn't anything extra added in that you might not want a beardie to ingest.
I would stick to raw veges. Along this line of thought though, you can scrape spaghetti squash into pasta/worm shapes and that tends to be pretty popular. Just be sure that it is chewed up well and the strands aren't too long. Butternut squash can be offered too. I've had good success offering it chopped into worm shapes, sliced thin with a peeler, or cooked and then worked into worm shapes by hand (this works with sweet potato too).