Hi, I believe that you can add 1 1/2 (one and a half) teaspoons of baking powder per cup of cake flour, and sift together several times. Then I would still add the additional 1/2 teaspoon baking powder that the recipe calls for. Hope that helps/works! Thanks!
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https://www.kingarthurflour.com/recipes/homemade-self-rising-flour-recipe
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