Preheat the oven to 375°F (190°C).
In a small bowl, mix together flour, baking soda, and baking powder.
In a large bowl, beat sugar and butter with an electric mixer until smooth.
Beat in egg and vanilla extract.
Gradually blend in the flour mixture.
Form dough into walnut-sized balls and arrange them 2 inches apart on ungreased baking sheets.
Bake until edges are golden, 8 to 10 minutes.
Let cookies cool on the baking sheets for a brief moment before transferring them to a wire rack to cool completely.
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