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Combine 13⅓ ounces warm water, yeast, and sugar in bowl and let sit until bubbly, about 5 minutes. Whisk in melted butter and molasses. Using stand mixer fitted with paddle, mix flour blend, oat flour, psyllium, baking powder, salt, and xanthan gum on low speed until combined, about 1 minute Slowly add yeast mixture and mix until combined, about 1 minute, scraping down bowl as needed. Increase speed to medium and beat until dough is sticky and uniform, about 6 minutes. (Dough will be quite stiff.)