These are the BEST gluten-free hamburger buns I have found so far. They have eggs in them, so they are not vegan.
I found this recipe on YouTube - it's creator is the Keto-King. There is a video link at the bottom of this recipe. I suggest you watch his video to get an idea of how to make these buns.
4 - 5 buns; depending on size you make them
The Keto King