I haven't tried it in this recipe but I'd substitute 1 cup of ground sunflower seeds for 1 cup of almond flour. (ketodietapp.com)
It is similar to almond butter, however it is made of ground sunflower seeds. (elanaspantry.com)
My children for the most part do not care for the baked goods that I have made with ground sunflower seeds, or sunflower seed butter. (elanaspantry.com)