01 - Preheat the oven to 350°F. 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 incorporated.
03 - In a separate bowl, combine the rolled oats, baking powder, cinnamon, and salt, stirring to distribute evenly.
04 - Add the dry ingredients to the wet mixture and stir until just combined. Do not overmix.
05 - Gently fold in the blueberries, taking care not to crush them.
06 - Pour the mixture into the prepared baking dish. Smooth the top evenly with a spatula.
07 - Sprinkle with almonds or walnuts and coarse sugar or brown sugar, if using.
08 - Bake for 35 to 40 minutes, or until the center is set and the top is golden brown.
09 - Allow to cool for 10 minutes before slicing. Serve warm or at room temperature.