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Preheat an oven to 325 degrees F (165 degrees C).
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Line a baking sheet with parchment paper.
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In a bowl, mix the flour, baking soda, and salt.
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In a separate large bowl, mix the butter, 1 cup confectioners' sugar, and vanilla until the mixture is smooth and creamy.
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Stir in the flour mixture; gently stir in the oatmeal and pecans and lightly mix until combined.
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With a spoon, drop about 1 scant tablespoon of dough per cookie onto the prepared baking sheet.
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Bake in the preheated oven until lightly browned, about 20 minutes.
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Let cool completely before sprinkling cookies with confectioners' sugar.