Preheat the oven to 350°F and prepare an 8×8-inch baking dish by greasing it or lining it with parchment paper.
Blend cottage cheese, eggs, sweetener, and vanilla extract for 30–45 seconds until smooth and creamy.
Combine the blended mixture with oats, baking powder, and salt in a large bowl. Stir until the batter is evenly mixed.
Fold blueberries gently into the batter using a spatula to keep them whole and evenly spread.
Pour the mixture into the prepared baking dish and smooth the surface.
Bake for 30–35 minutes until the top turns lightly golden and the center is firm.
Allow the bake to cool for 10–15 minutes before slicing.
Serve warm or chilled with yogurt, extra blueberries, nuts, or a drizzle of honey.