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Preheat oven to 350F. Line 2 cookie sheets with parchment paper.
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Beat butter and brown sugar with an electric mixer until light and fluffy. Add eggs, one at a time, and vanilla; beat until combined.
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In a separate bowl, stir together flour, baking soda, and salt. Add to butter mixture and beat until just combined. Fold in chocolate chips and pecans with a rubber spatula.
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Drop dough by rounded tablespoon onto the prepared pans, leaving about 2 inches between each one. Bake 8 - 10 minutes, switching pans halfway through. Cookies should be lightly golden but noy browned. Overbaking will result in crunchy cookies.
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Let cool on cookie sheets for about 2 minutes before transferring to a wire rack to cool completely.