Preheat the oven to 350°F (175°C).
In a large mixing bowl, whisk together the cottage cheese, rolled oats, eggs, milk, honey (or maple syrup), vanilla extract, baking powder, salt, and cinnamon until well combined.
Gently fold in the blueberries, ensuring they are evenly distributed throughout the mixture.
Pour the mixture into a greased 9x13 inch baking dish and spread it out evenly.
Bake in the preheated oven for 30 minutes, or until the top is golden brown and set in the center.
Remove from the oven and let it cool for a few minutes before slicing into squares.
This dish can be made ahead of time and stored in the refrigerator for up to 3 days. Just reheat before serving.
Feel free to add other fruits or nuts for extra flavor and texture.