In a large bowl, beat butter and sugar with a mixer at medium speed until fluffy, 3 to 4 minutes, stopping to scrape sides of the bowl. Add eggs, one at a time, beating well after each addition. Beat in vanilla.
In a medium bowl, whisk together flour, baking soda, salt, flaxseed, ground cinnamon, ground cardamom, ground ginger, ground cloves, ground nutmeg, and ground pepper.
Gradually add flour mixture to butter and sugar mixture, beating until combined. Add chocolate chips; beat until combined. Cover and refrigerate for at least 1 hour.
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