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Preheat waffle iron, set oven to 200 degrees F, and slide a baking sheet in it to warm.
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Melt butter and set aside to cool.
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In a large bowl, combine flours, baking powder and soda, spices, and sea salt.
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In a medium bowl, combine egg yolks, shredded apple, buttermilk, and sugar. Fold wet ingredients into dry. Fold in melted butter.
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Beat egg whites to soft peaks and fold into batter, stirring just until everything is nicely combined.
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If needed, grease waffle iron, and then cook waffles according to your waffle iron’s instructions. Set cooked waffles on baking sheet in warm oven.
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Meanwhile, set a medium-sized skillet over medium to medium-high heat. Melt the butter, then toss in the sliced apples, sugar, cinnamon, and sea salt. Cook apples for about 3 minutes, flip, and cook 3 minutes more. Edge heat down if pan gets too hot. Apples should be soft with browned edges, and surrounded by a thick, golden brown syrup.
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Serve waffles topped with apples and syrup, and a sprinkle of cinnamon.