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Preheat oven to 350F.
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Line a 9-inch round cake pan with parchment paper. (You can use a small rectangle cake pan too, we just didn’t have one)
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Start with whisking the egg whites on medium speed until they start to get fluffy and white.
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Slowly add the sugar into the egg whites. After you add the sugar, turn up the speed to high and whisk until stiff peaks form.
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Next, fold in the egg yolks and sift in the matcha powder and flour.
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Pour batter into cake pan and bake for 12 minutes.