Preheat the oven to 180°C (350°F).

Wash and dry the apples thoroughly.

Cut off the top of each apple and set it aside.

Using a spoon, remove the seeds and core to create a hollow cavity.

Sprinkle some cinnamon, Stevia, and raisins inside the cavity.

Place the apples in a baking tray and bake for 25-30 minutes, or until they become tender.

Serve the baked apples warm, topped with the chopped walnuts.