Preheat the oven to 375°F. Lightly spray a 12-count donut pan with cooking spray.
In a large mixing bowl, add the self-rising flour, cottage cheese, milk, and sugar (if using). Mix until a thick dough remains. If the dough is too thick, add a tablespoon or two more of milk. If it is too thin, add an extra tablespoon of flour.
Transfer the donut batter to the donut pan. Bake for 15-17 minutes or until they bounce back and are golden around the edges. Remove from the oven.
While the donuts are baking, whisk the sugar and cinnamon to a bowl.
Spray all sides of the donuts with cooking spray or melted butter. Moving quickly, dip each donut in the cinnamon sugar mixture, ensuring all both sides are coated.
Notes
Tips: See my recipe tips above for making the best cottage cheese donuts.
Melted butter: If you don't use cooking spray, use two tablespoons of melted butter.
Leftovers: Keep in the fridge for up to five days or the freezer for up to 6 months.