Gluten-Free Sugar Cookies

Substances:

• 2¼ cups white rice flour, plus more for rolling
• ½ cup cornstarch
• 1 tsp. baking soda
• ½ tsp. baking powder
• ½ tsp. cream of tartar
• ½ tsp. salt
• ½ cup butter, softened, plus more for greasing
• ½ cup shortening
• ½ cup sugar
• ½ cup confectioners sugar
• 2 eggs
• ½ tsp. vanilla
• Decorating sugar (non-primary)

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