I use
this doughnut pan from Amazon.
Check out my
Cinnamon Raisin Bagels and
Plain bagels.
The bagels freeze great. I just cut them in half, wrap in a layer of saran wrap, then wrap in a layer of tin foil.
Almond flour, ground flax, or tapioca starch may be used instead of arrowroot flour. The almond flour and flax will give you about 2g less of carbs per bagel.