Preheat oven to 350° and line an 8”x 8” baking pan with parchment paper.
In a large bowl combine flour, salt, and baking soda.
In a medium bowl stir butter, brown sugar, and granulated sugar until combined. Whisk in egg until a silky mixture forms.
Fold dry ingredients into wet ingredients.
Divide dough into thirds. Fold cocoa and chocolate chips into one third, cherries into one third, and pistachios into another third.
Spread chocolate dough on the bottom of the pan. Place in the freezer for 10 minutes to firm up. Spread the cherry layer on top of the chocolate layer. Place in the freezer for 10 minutes. Spread pistachio layer on top of cherry layer. Bake for 30 to 35 minutes or until lightly golden brown around the edges. They will be slightly fudgy in the center. Cool for about 20 to 30 minutes.
Cut into desired pieces (12 is my rec.) and serve. Tip: Freeze for up to 1 month, thaw and enjoy.