Prepare the Oats: In a large mixing bowl, pour the hot water over the rolled oats. Stir and let them soak for about 10 minutes, allowing the oats to soften.

Mix the Wet Ingredients: In a separate bowl, whisk together the egg whites, stevia, vanilla extract, avocado oil, and vinegar until well combined.

Combine the Dry and Wet Ingredients: Add the baking powder to the soaked oats and stir. Then pour in the wet mixture and mix until fully incorporated.

Add the Fruits: Fold in the chopped apple and blueberries, ensuring the fruits are evenly distributed throughout the batter.

Prepare the Baking Dish: Preheat your oven to 350°F (175°C). Lightly grease a baking dish with avocado oil to prevent sticking.

Bake: Pour the oat mixture into the greased dish and spread it out evenly. Bake for 25-30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.

Cool and Serve: Let the bake cool for a few minutes before slicing. Serve warm or at room temperature. You can enjoy it on its own or with a dollop of yogurt or a drizzle of honey.