Preheat oven to 325 degrees F (165 degrees C). Grease two cookie sheets.
Combine oats, flax seeds, brewer’s yeast, cheese, rice flour, oat bran flour and sugar in a large bowl. Whisk together chicken broth and eggs; mix with oat mixture to make a fairly stiff dough.
Roll dough into 1 inch balls, then flatten into discs. (Or, roll dough out on a floured surface to 1/4 or 3/8 inch thick and cut into 1-inch x 1 1/2-inch rectangles.) Place on cookie sheets 3/4 inch apart.
Bake until dry and the edges turn a light golden brown, 40 to 45 minutes. Cool before serving.