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In a bowl, beat together butter and brown sugar until light and fluffy, about 3 minutes.
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Add the eggs and vanilla. Mix until the yolks are fully incorporated.
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Add in the baking soda and flour. Mix on low until fully incorporated.
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Stir in the chocolate chips, toffee bits and pecans.
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Scoop the dough with a large cookie scoop and place on parchment paper lined cookie sheet. Transfer cookie sheet to refrigerator and chill at least 2 hours. Can chill up to 2 days.
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Preheat oven to 350 F. Line baking sheet with parchment paper.
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Place the chilled dough on the baking sheet 2 inches apart. Keep remaining cookie dough balls in the refrigerator in between batches.
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Bake for 10 to 12 minutes, until the edges are golden and the tops are just set.
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Cool on baking sheet for 4 to 5 minutes. Transfer to wire rack to cool completely.