Place the chicken in a saucepan filled with water and allow it to come to the boil. Reduce the temperature and let it simmer until the chicken is fully cooked, approximately 20 minutes. Remove the chicken from the saucepan, cool, pat dry and shred into very, very fine shreds. Mix the rice flour or corn starch with some milk. Add the cream, sugar and the rest of the milk to a pot and boil.