Cut bread into 1/2-in. cubes; place into a greased 20-oz. baking dish. In a bowl, combine the egg yolk, cream, milk, sugar, butter, vanilla, nutmeg and cinnamon. Stir in blueberries. Pour over bread cubes. Cover and refrigerate for 30 minutes.
Bake, uncovered, at 350° for 30 minutes or until top is golden brown and a knife inserted in the center comes out clean. Sprinkle with confectioners' sugar and serve warm.