Preheat oven to 400°F.
Scald milk and pour slowly onto cornmeal. Let sit 5 minutes, and then add rice. Stir to mix. Sift together dry ingredients and add to cornmeal mixture with egg yolk and shortening. Stir gently to blend. Fold in beaten egg white, then blueberries, and spoon into well-greased muffin pans. Bake about 25 minutes, until nicely browned. Serve warm.