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Pre-heat oven to 350 degrees. Grease a donut pan.
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Mix all of the dry ingredients together (oat flour to orange zest).
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In a separate bowl, beat egg and sugars until frothy. Add in remaining wet ingredients and mix until smooth (eggs to vanilla).
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Combine wet and dry ingredients until well incorporated.
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Gently fold in the shredded apples.
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Pour batter into a piping bag (or zip lock bag with one corner cut off). Pipe batter into each donut cavity, about 3/4 full. Recipe should make 12 donuts.
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Bake for 10 minutes. Let cool slightly then remove from donut pan. Let cool completely before glazing.
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To make the glaze, combine all of the ingredients and mix well until it is a smooth consistency.
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Dunk each donut into the glaze and top with chopped nuts.
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10. Serve and enjoy!