In a large mixing bowl pour hot broth over oatmeal and margarine and let sit for 5 minutes. Add powdered milk, cheese, and eggs. Add cornmeal and brewer's yeast, mix well. Add flour 1 cup at a time as needed until dough makes a ball. On a floured kneading board, knead dough adding flour until dough does not stick to board.
Place biscuits on a lightly greased cookie sheet.
It helps to turn the biscuits over after about 30 minutes. With a knife, cut dough into 2 by 3 inch squares. Bake as described above. When cooled, break each square along the score lines to make small tidbits. For dogs who can eat wheat, the above recipe can be made using whole wheat flour.