In a large mixing bowl, combine the cubed apple and wild yam, milk powder, and Baby Angel's Homemade Superfood Powder. Blend all ingredients together until a smooth mixture forms.
Apply a small amount of oil to a heatproof dish to prevent the cake from sticking.
Transfer the mixture to a heatproof dish or steam bowl.
Add the egg yolks to the mixture and mix until well combined.Cover the dish with baking paper, making a few small holes to allow steam to escape.
Steam the mixture for about 25 minutes, or until a toothpick inserted into the center comes out clean.
Once the steamed cake is cooked, let it cool before removing it from the dish.
Cut the steamed cake into small pieces and serve to your baby.