Instructions:
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Preheat oven to 350°F. Weigh out all ingredients in separate bowls for efficiency.
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Whisk together Sugar #1 and egg yolks until the sugar is dissolved. Add in orange juice, vegetable oil, and orange zest. Whisk until fully combined.
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Sift the whole wheat flour, baking powder, and salt together. Add the dry ingredients to the egg yolk mixture and gently fold with a spatula until just combined. Be careful not to overmix.
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Make the meringue: In a stand mixer with a whisk attachment, beat the egg whites at speed 4. Gradually add Sugar #2 in three increments. Continue whisking until stiff peaks form — don’t under- or overmix.
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Combine: Gently fold the meringue into the batter until fully incorporated.
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Bake: Pour the batter into an ungreased aluminum chiffon cake pan, filling up to 75%. Bake at 350°F for 40–50 minutes.
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Cool: Immediately after baking, flip the pan upside down to prevent the cake from collapsing. Let it cool for 1 hour before removing it from the pan.