Preheat your oven to 180°C (350°F) and gather your equipment.

In your blender, combine oats, apple cubes, honey (or brown sugar), vanilla extract, cinnamon, baking soda, and baking powder. Add yogurt, eggs, and melted butter (or coconut oil) to the mixture and blend until smooth.

Transfer the blended mixture to your mixing bowl and gently fold in the remaining oats.

Line your small baking pan with parchment paper and pour the prepared cake batter into the pan.

Place your baking pan in the oven and bake for 20-30 minutes, checking for doneness.

Remove the cake from the oven and let it cool in the pan for about 10 minutes before transferring it to a wire rack.

Slice the cake and store it in an airtight container.