In a large mixing bowl, combine gluten-free bread flour blend, instant yeast, granulated sugar, and kosher salt.

In a separate bowl, mix warm water and unsalted butter until melted.

Gradually add the wet mixture to the dry ingredients, stirring until a dough forms.

Divide the dough into 8 equal pieces and shape each piece into a bagel.

In a large pot, bring 6 cups of water to a boil and add molasses and kosher salt.

Boil each bagel for about 1 minute on each side, then remove and place on a baking sheet.

Sprinkle with seeds if desired.

Bake in a preheated oven until golden brown, about 25 minutes.