Prep time: 30 minutes Total time: 3 hours Servings: 52 cookies 1 cup Cocoa Pebbles, divided 2 cups all-purpose flour 1/2 cup unsweetened cocoa powder 2 teaspoons cream of tartar 1 teaspoon baking soda 1/2 teaspoon salt 1 cup (2 sticks) unsalted butter, room temperature 1 3/4 cups sugar, divided 2 large eggs 1 teaspoon vanilla 2 teaspoons cinnamon 1/4 teaspoon chili powder (optional) Heat oven to 350 F. In food processor, crush cereal to yield 1/2 cup. In medium bowl, combine 1/4 cup ground cereal, flour, cocoa powder, cream of tartar, baking soda and salt. In large bowl, using…