Preheat your oven to 350°F (175°C). Grease an 8x8-inch baking dish with butter.
In a large mixing bowl, combine the cottage cheese, rolled oats, milk, honey (or maple syrup), eggs, vanilla extract, baking powder, cinnamon, and salt. Mix until well combined.
Gently fold in the blueberries, being careful not to break them.
Pour the mixture into the prepared baking dish and spread it evenly.
Bake in the preheated oven for 30-35 minutes, or until the top is golden and a toothpick inserted in the center comes out clean.
Allow to cool for about 10 minutes before slicing and serving.