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In a small bowl, whisk together flour, baking soda, and salt. Set aside. 
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In a large bowl, beat together butter and shortening until well-combined. 
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Add sugars, and beat for about 4-5 minutes on high, or until very well-combined. 
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Add eggs, one at a time, and vanilla; beat in for 3 minutes. 
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Stir in flour mixture until just combined. 
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Add chocolate chips or chunks, and stir in. 
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Cover, and refrigerate dough for at least 2 hours. 
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Preheat oven to 375, and line 2 baking sheets with parchment paper. 
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Drop dough by medium scoops (1.5 tablespoons) onto prepared cookie sheets. 
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Bake for about 8-10 minutes, or until very lightly browned at the edges. 
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Remove from oven, and let cool on baking sheet.