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In a medium bowl, whisk together flour, baking powder, baking soda, cinnamon, and nutmeg; set aside.
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In a large bowl, stir together buttermilk, vanilla, bananas, and melted butter.
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Add flour mixture to buttermilk mixture, and stir until just combined.
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Spray waffle iron with nonstick cooking spray and add batter according to waffle iron’s directions (I have a 4-square waffle iron, and I used 1 cup of batter per waffle).
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Sprinkle waffle with pearl sugar or broken sugar cubes.
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Cook waffles according to your waffle iron’s directions.
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Be careful removing waffle from iron – the sugar will caramelize and is extremely hot.