Add yogurt, eggs, honey, vanilla and salt to the dish. Mix until smooth.
Stir in the rolled oats and let the mixture rest for 5 minutes.
Add baking powder if using and mix gently.
Scatter blueberries and coconut flakes over the top.
Bake for 25–30 minutes, until golden and set in the centre.
Let the cake rest for 5–10 minutes before serving.
Serve warm with yogurt, berries or a drizzle of honey.
Notes
Use rolled oats for the best texture. If using frozen blueberries, add them directly from the freezer. Do not overbake; the cake should stay soft and moist inside.