01 - Preheat oven to 350°F. Grease a 9x9-inch baking dish with butter.
02 - Whisk cottage cheese, eggs, milk, maple syrup, vanilla extract, and melted butter in a large bowl until smooth.
03 - Mix rolled oats, baking powder, cinnamon, and salt in a separate bowl.
04 - Add dry ingredients to wet mixture and stir until just combined.
05 - Gently fold blueberries into the batter.
06 - Pour mixture into prepared baking dish and smooth top with spatula.
07 - Sprinkle almonds or walnuts and sugar evenly over top, if using.
08 - Bake for 35 to 40 minutes until center is set and top is golden brown.
09 - Cool for 10 minutes before slicing. Serve warm or at room temperature.