Preheat oven to 375 degrees.
In a large bowl, combine oatmeal, sage, flour, onion soup mix, eggs, and cottage cheese. Mix well to fully combine. Do not add the mushroom soup yet.
Shape the oatmeal mixture into evenly sized patties.
Heat a skillet over medium heat with a little oil or butter. Fry patties briefly on both sides until lightly browned.
Place the browned patties in a greased baking dish. In a small bowl, combine the mushroom soup with ½ cup of water. Pour the diluted soup evenly over the patties.
Cover the dish and bake for 45 minutes, until hot and set. Serve warm.