In a medium bowl, whisk together egg yolks and milk. Stir in flour, baking powder and salt. Stir in butter, and set mixture aside for about 30 minutes.
Preheat a lightly greased waffle iron.
Fold egg whites and 2/3 cup blueberries into the mixture. Scoop portions of the mixture into the prepared waffle iron, and cook until golden brown.
To prepare the sauce, in a medium saucepan over medium heat, mix 1 1/2 cups blueberries, honey and 1/4 cup orange juice. Bring to a boil. Mix remaining orange juice and cornstarch in a small bowl, and stir into the blueberry mixture. Stir constantly until thickened. Serve warm over waffles.
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