01 - Preheat oven to 350°F. Grease a 9x9-inch baking dish with butter.
02 - In a large bowl, whisk together cottage cheese, eggs, milk, maple syrup, vanilla extract, and melted butter until smooth.
03 - In a separate bowl, combine rolled oats, baking powder, cinnamon, and salt.
04 - Add dry ingredients to the wet mixture and stir until just combined.
05 - Gently fold in the blueberries.
06 - Pour mixture into the prepared baking dish. Smooth the top 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 center is set and top is golden brown.
09 - Allow to cool for 10 minutes before slicing. Serve warm or at room temperature.