Preheat your oven to 340°F (170°C). Grease or line an 8x8 inch (20x20cm) baking dish.
In a large mixing bowl, combine the Greek yogurt, eggs, chosen sweetener (maple syrup or agave), and oat flour. Whisk together until smooth and well incorporated.
Gently fold in the blueberries until evenly distributed throughout the batter.
Pour the mixture into the prepared baking dish.
Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the top is set and golden brown on the edges.
Once baked, remove from the oven and let it cool for 5 minutes before slicing.
Serve warm or at room temperature, and enjoy this delightful and nutritious yogurt bake!