01 - Preheat the oven to 350°F. Generously grease a 9x9-inch baking dish with butter.
02 - In a large bowl, whisk together the cottage cheese, eggs, milk, maple syrup or honey, vanilla extract, and melted butter until smooth and well combined.
03 - In a separate bowl, combine the rolled oats, baking powder, cinnamon, and salt.
04 - Add the dry ingredients to the wet mixture. Stir until just combined, being careful not to overmix.
05 - Gently fold the blueberries into the batter.
06 - Pour the mixture into the prepared baking dish. Smooth the top evenly with a spatula.
07 - Sprinkle almonds or walnuts and coarse sugar or brown sugar evenly over the top, if using.
08 - Bake for 35 to 40 minutes, until the center is set and the top is golden brown.
09 - Let the bake cool for 10 minutes before slicing. Serve warm or at room temperature.