Dark Velvet Beet Cookies

Ingredients

• 3/4 cup beet puree (about 2 medium beets)
• 1/4 cup buttermilk
• 1 cup unsalted butter, at room temperature
• 1 cup granulated sugar
• 1/2 cup light brown sugar
• 1/3 cup cocoa powder, sifted
• 2 teaspoons vanilla extract
• 1 tablespoon cider vinegar
• 1/2 teaspoon salt
• 1 egg
• 2 1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1 (12 ounce) bag white chocolate chips