Pour the sauce followed by cinnamon and nutmeg over the apple mixture.
Continue to cook for about 8-9 minutes till the liquid becomes syrupy. Remove from the flame and cool.
Once cool, blend the fresh chilled yogurt with caramel apple pie filling (reserve 3-4 tbsp, optional) to a smooth consistency.
Optional: Add the reserved caramel apple pie filling to serving glasses. Drizzle the sides with extra caramel.
Pour the lassi onto serving glasses, garnish with a sprinkle of cinnamon and a drizzle of caramel and serve immediately.