1
In a bowl, whisk together flour, cocoa powder, baking soda, and salt. In another bowl, beat softened butter, granulated sugar, and brown sugar.
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2
Add the egg and vanilla, and beat just until smooth and combined. Add the dry ingredients in 2 additions, mixing on low speed.
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3
Portion the chilled dough into 30 equal mounds. Arrange them 2 inches apart on prepared baking sheets. Use the bottom of a clean glass or your palm to flatten each ball.
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