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The night before you plan to serve the waffles, combine the buttermilk, orange juice and oats in a medium bowl.
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Mix well, cover, and refrigerate over night.
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In a large bowl, whisk the egg.
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Add the sugar and mix.
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Add the flours, baking soda, salt and the oat mixture and mix well.
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Stir in the melted butter. The batter will be slightly lumpy.
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Preheat and lightly grease a waffle iron.
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Spoon a generous 1/2 cup of batter onto the hot iron and close the lid.
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Cook until no more steam escapes from the iron and the waffle is golden on both sides, about 5 minutes.
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Serve immediately with butter and maple syrup.