In a medium bowl, sift together the flour, baking soda, and salt. Set aside. In a larger bowl, beat the butter and sugars together on medium speed until light and fluffy (about 2-3 minutes). On low speed, slowly add the beaten egg and vanilla extract. Beat to combine, scrape down the sides of the bowl. Add the flour mixture and beat just until there are no more streaks of flour. Stir in the chocolate chips, peanut butter chips, and pretzels. Cover and refrigerate for an hour.
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